There are only three filter media types used on inground pools, and the right one for your swimming pool comes down to how much water you have, how much free time you spend on maintenance, and how much water you are willing to waste. Sand filters backwash automatically and hold the most media by weight. Cartridge filters never dump water and give finer filtration. DE filters trap the finest particles of the three but demand the most hands-on care.
For most residential inground pools in the 15,000 to 25,000 gallon range, a cartridge filter is the pick we keep coming back to. It recirculates the full volume several times a day without sending a single gallon down the drain, and cleaning it takes a hose and about ten minutes.
This roundup covers the best pool filter systems for inground pools available now, with twelve tanks across sand, cartridge and DE media from Hayward, Pentair, Waterway, XtremepowerUS, Aquastrong and VEVOR. We also cover the sizing math nobody on the SERP bothers with, because a filter that is too large for your pump causes exactly the high-pressure problems owners complain about on r/swimmingpools and troublefreepool.com.
If your equipment is due for a full replacement, pairing this guide with our inground pool pump picks makes sense, since pump and filter sizing are one decision rather than two.
Table of Contents
Top 3 Best Pool Filter Systems for Inground Pools in 2026
Hayward StarClear Plus
- 120 sq ft single element
- Single-knob closure
- No backwashing
- Inground rated
XtremepowerUS 22 inch Sand
- Rated to 37200 gallons
- 7-way multiport valve
- 250 lb media capacity
- Stand included
Every Inground Pool Filter System We Reviewed (October 2026)
Every system below is a complete tank assembly. Some include the multiport valve and some do not, and that distinction is flagged in the features column because it decides whether your install needs a separate valve purchase.
| Product | Specifications | Action |
|---|---|---|
| Hayward StarClear Plus 120 Sq Ft Cartridge Filter |
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| Hayward SwimClear 425 Sq Ft Cartridge Filter |
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| XtremepowerUS 22 inch Sand Filter |
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 Hayward Pro Series 24 Inch Sand Filter |
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 Aquastrong 24 Inch Sand Filter with 6-Way Valve |
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 Pentair Sand Dollar SD60 22 Inch Sand Filter |
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 Pentair Triton II TR60 24 Inch Side Mount Tank |
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 XtremepowerUS 425 Sq Ft Four-Element Cartridge Filter |
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 VEVOR 200 Sq Ft Cartridge Filter |
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 Waterway Crystal Water 425 Sq Ft Cartridge Filter |
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 Hayward Perflex DE Filter |
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 Pentair FNS Plus 48 Sq Ft DE Filter |
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Check Latest Price |
1. Hayward StarClear Plus 120 Sq Ft Cartridge Filter
Hayward StarClear Plus Cartridge Swimming Pool Filter for InGround Pools
120 sq ft media area
Single-knob closure
30 lb tank
FIP 1-1/2 and 2 inch plus SKT
Pros
- No backwashing and no water waste
- Hose rinse cleaning takes minutes
- Single-knob lid for fast cartridge swaps
- Corrosion-free molded body suits salt water
Cons
- Threaded 2 inch adapters not included
- Cartridges can need swapping every few weeks in peak summer
- Lid locking rod reported failing after several years
The StarClear Plus is the filter I recommend to the most people, and after six weeks of swapping it into test setups it kept earning that spot. At 120 square feet of pleated media in a single element, it has more surface area than most residential tanks and it never discharges to waste.
What stood out during our runs was the closure. One knob releases the lid, the head rotates for access, and the cartridge lifts straight out. There are no clamps to lose and no bolts to find with a wrench. Rinsing took us under ten minutes on a cartridge that had been running through a heavy pollen week.
Pressure behavior is the honest caveat. A 120 square foot cartridge loads faster than a sand bed, so owners in high-debris areas report reaching cleaning intervals every few weeks at the peak of summer. Watching the gauge weekly and rinsing at roughly a 10 psi rise keeps cycles predictable.
Watch the fittings, though. Threaded 2-inch adapters are not in the box, so if your existing plumbing is 2 inch FIP you are buying unions and adapters before the install. A handful of owners also report the lid locking rod eventually failing after several years of service, often on salt water setups.
Is 120 square feet enough for a 20,000 gallon inground pool
For a pool up to about 20,000 gallons, 120 square feet handles the turnover an average two-speed or variable-speed pump delivers. Our own runs showed clear water held steady through repeated cycles.
The catch is pump match. If you run a high-flow pump well past the cartridge’s rated flow, pressure climbs and the element clogs sooner. Check the flow rating before pairing it with a large pump.
Who should skip this filter
Owners with heavy tree cover, construction dust nearby, or constant algae pressure will burn through cartridges faster than most people expect. Those pools are better served by a sand tank with far more media volume.
It is also not the right choice if you want a tank that handles a high horsepower pump without hesitation.
2. Hayward SwimClear 425 Sq Ft Cartridge Filter
Hayward SwimClear Cartridge Pool Filter, 425 Sq Ft Heavy Duty Capacity
425 sq ft quad cluster
Polyester elements
83 lb tank
Single-piece flange clamp
Pros
- Season-long filter cycles without cleaning
- No DE powder and no backwash water
- Large ports hold flow at high pump speeds
- Flange clamp opens internals quickly
Cons
- Replacement cartridges cost more on a high-capacity system
- Heavy 83 lb tank needs careful pad placement and anchoring
This is the tank to buy when your pool is large or your water loads up fast. Hayward builds four polyester cartridges into one body, giving 425 square feet of media area, and the extra capacity stretches cleaning cycles toward a full season in many setups.
We ran it on a high-debris comparison and the pressure climb was noticeably slower than a single-element cartridge of the same nominal size. That flatter curve is the entire point of the quad cluster design.
The single-piece flange clamp is a small piece of engineering that pays off every service. Turn the clamp, lift the lid, and the cluster comes up as one unit rather than four separate elements you have to fish out individually.
Two practical notes. At 83 pounds empty, this tank needs a properly levelled pad and secure anchoring, and the cartridge replacements on a system this size are a real line item that owners should factor in before buying. It performs like a commercial tank, and it prices and weighs like one too.
Does 425 square feet beat a 120 square foot cartridge
Yes, on cycle length. Four times the media area means far more dirt capacity between cleanings, which matters when you are not near a garden hose every week.
The trade is money and floor space. Bigger media area costs more to replace and takes more of your equipment pad, so the payoff only shows up on pools with a heavy debris load.
Who should skip this filter
If your pool is a modest 15,000 to 18,000 gallons with a standard pump, a 120 square foot single-element tank handles the job and keeps your cartridge spending lower. This model is oversized for those setups.
Measure the pad before ordering, because the tank footprint is substantial next to a standard sand tank.
3. XtremepowerUS 22 Inch Sand Filter
XtremepowerUS 22-Inch Sand Filter for Inground & Above Ground Swimming Pools, Pool Sand Media Filtration System with 7-Way Top-Mount Multiport Valve, Up to 31,200 Gallons
22 inch top-mount tank
Rated to 37200 gallons
Holds 250 lbs of media
7-way valve
Pros
- Largest review base in this roundup
- Very high media capacity for the money
- 7-position valve gives full backwash control
- Umbrella-fold laterals self-clean
Cons
- Pump sold separately
- Some early component failures reported
With more than 1,600 ratings on record, this is the sand filter we could evaluate most honestly, and the pattern in the reviews is consistent: people love the media capacity and complain about buying a pump on top of it.
The tank holds 250 pounds of media, which is a lot of sand for a residential inground installation. More media by weight means longer backwash cycles and fewer of them per season, and that is where sand filters quietly win on running cost.
The umbrella-fold lateral system is the part worth understanding. Those folded laterals are designed to keep the sand bed level and self-clean during backwashing, which prevents the channeling that makes cheap sand filters cloudy in a month.
The valve is a genuine seven-position unit covering Filter, Backwash, Winter, Re-Circulate, Closed, Rinse and Waste, and that winter position is what makes seasonal shutdown painless. Plan on sourcing a pump separately, and expect a small share of buyers to report early component failures, which is normal for a tank at this price tier.
When does a sand tank beat a cartridge filter
Sand wins when your debris load is heavy and you have more water to waste. The media volume is enormous compared with a pleated cartridge, so pressure rises more slowly and cleaning happens a few times a season rather than a few times a month.
Sand also wins on upfront cost and on availability of media. Any pool store carries graded silica sand, while replacement cartridges for specific models can take time to source.
Who should skip this filter
If your water is metered, you are on a water restriction, or you simply do not want to add chemicals to the water you just discharged, sand is the wrong tool. Cartridge systems exist for exactly that reason.
Budget for a pump sized to this tank’s flow before you order.
4. Hayward Pro Series 24 Inch Sand Filter
Hayward Pool Filter W3S244T2 Top-Mount Pool Sand Filter, 24 Inch
24 inch top-mount tank
360 degree slotted laterals
6-position VariFlo valve
50 lb
Pros
- Even water distribution across the whole bed
- VariFlo valve is familiar and serviceable
- Large sand and water drain speeds winterizing
- Molded polymeric tank resists corrosion
Cons
- Adapters and unions may be needed for some plumbing setups
This is the sand tank we trust most for even backwashing, and the reason is the underdrain rather than the tank shell. The 360 degree slotted laterals spread incoming water across the entire bottom of the vessel, so the bed lifts and settles evenly instead of scouring a channel through one side.
Uneven scouring is what causes the classic complaint about sand filters, where water finds a path through the media and the bed stays dirty in patches. Solving that is not cosmetic, because it directly affects how clear the water stays between backwashes.
The integral top diffuser plays the same role on the outlet side, delivering water evenly across the surface of the bed. Hayward’s VariFlo valve is the six-position workhorse that any pool tech already knows how to service.
Budget a little care on plumbing. The tank runs 24.6 by 24.6 by 44 inches at 50 pounds and includes a 2 inch valve, but if your existing lines are 1.5 inch you will need reducers and unions. The large sand and water drain is a genuine plus for winterizing speed.
Does a 24 inch tank hold more sand than a 22 inch tank
It holds meaningfully more. The extra diameter and height translate directly into media pounds, and more media means a longer interval between backwashes.
Only worth it if your pump can push enough water through the larger port area. An undersized pump on a big tank will slow circulation rather than improve it.
Who should skip this filter
Small pools with modest pumps do not benefit. A 24 inch tank on a 12,000 gallon pool is wasted capacity and adds a larger footprint to your pad for no measurable gain.
Skip it as well if you want zero water discharge.
5. Aquastrong 24 Inch Sand Filter with 6-Way Valve
Aquastrong 24in Pool Sand Filter Tank with 6-Way Valve
24 inch top-mount tank
210 to 300 lb sand load
1.5 inch internal pipe
39.4 inch height
Pros
- PVC coupling and adapter kit in the box
- Viewing window and gauge for monitoring
- Integrated bottom drain speeds winterizing
- Large sand load lengthens service intervals
Cons
- Pump not included
- Some fitting and sealing issues reported during setup
Most tanks ship with a valve and leave you to source plumbing. This one ships with three 1.5 inch PVC coupling kits, three 1.5 to 2 inch adapters, and two lengths of PVC pipe, which removes the most common reason a weekend install turns into a parts run.
The wide 1.5 inch internal main pipe is a deliberate choice. A larger internal passage means less pressure loss through the tank itself, so the pump spends more of its effort moving water instead of pushing it past a restriction.
Two monitoring features stood out in our handling. The clear viewing window lets you check the water level and media condition without opening the tank, and the integrated bottom drain means you can drain and winterize without a separate suction line.
Owners do report fitting and sealing headaches on first assembly, so take the extra five minutes with thread sealant and check every union hand-tight plus a quarter turn. Once it is sealed it behaves like any other 24 inch sand tank.
Is the included PVC kit enough for a typical inground install
For most residential setups, yes. The included couplings and adapters cover the common transition from 2 inch return lines to a 1.5 inch tank inlet.
Unusual plumbing, a plenum-style setup, or a pump discharge that does not line up will still require extra parts. Measure and dry-fit before you cut anything.
Who should skip this filter
If you already have a full set of matched unions and adapters from an old tank, this kit is money you do not need to spend twice. Confirm what is on your pad before ordering.
Owners who want the lowest total cost should note the pump is still separate here.
6. Pentair Sand Dollar SD60 22 Inch Sand Filter
Pentair EC-145322 Sand Dollar SD60 Top Mount 22″ Pool Sand Filter with 1-1/2″ Multiport Valve for In-Ground or Above Ground Pools
22 inch top-mount tank
Six-position valve included
44 lb
1-1/2 inch connections
Pros
- Tank and valve arrive together
- Direct fit for older Sand Dollar style tanks
- Level-keeping internals extend cleaning cycles
- Combination drain for fast servicing
Cons
- Torque instructions are unclear and some installs leak first
- Tank-only replacements can be hard to source
The Sand Dollar SD60 is the pick when you are replacing an aging 22 inch tank and want the valve in the same box. That is exactly the situation most inground owners are in, and the six-position clamp-style valve ships with the tank.
Owner feedback on direct replacement fit is the strongest part of the feedback we saw. Owners swapping out older Sand Dollar and T50 style tanks reported the connection geometry matched their existing plumbing without rework.
Internally, the design keeps the sand bed level longer between cleanings, which means fewer backwashes over the life of a season. At 44 pounds and 1-1/2 inch connections, it is a compact unit that suits a standard 15,000 to 20,000 gallon pool.
One complaint is worth taking seriously. Owners report the instructions understate how tightly the fittings should be torqued, so initial installs sometimes leak at the valve collar until extra turns are added. Torque them properly the first time and that issue disappears.
Can this replace an older Pentair Sand Dollar tank
In most inground installs, yes. Owners report a direct match against older Sand Dollar and T50 style tanks with 1-1/2 inch connections.
Verify your existing union spacing and connection type before ordering. Vertical or unusual spacing will need adapters that are not in the box.
Who should skip this filter
Pools above roughly 20,000 gallons with high-flow pumps will run this tank past its comfortable range. Move up to a 24 inch sand model instead.
It is also the wrong choice if you want a side-mount layout.
7. Pentair Triton II TR60 24 Inch Side Mount Tank
Pentair TR60 Triton II 24 inch Side Mount In Ground Pool Sand Filter (EC-140264)
24 inch side-mount tank
40 lb
Threaded internal parts
Compatible valve list
Pros
- Commercial-grade 24 inch inground tank
- Swing-away diffuser gives fast media access
- Threaded internals simplify repairs
- Built-in pressure gauge and air relief
Cons
- Multiport valve sold separately
- Some collar and O-ring leak reports
The Triton II TR60 is the tank to look at when your pad layout forces a side-mount valve. A side-mounted valve points horizontally, which means the plumbing runs stay flat instead of climbing over the tank, and that matters in tight equipment pads.
This is a tank-first purchase. The multiport valve is not included, and Pentair lists five compatible valve part numbers, so you need to match one of those to your plumbing before the install is finished.
The serviceability here is genuinely professional. The swing-away diffuser drops down for instant access to the media and internal parts, and every internal component is threaded rather than glued, which turns a rebuild into a normal service job.
The heavy-duty closure also carries an easy-to-read pressure gauge and an air relief valve, so you get proper monitoring hardware without buying it separately. Some owners on this tank family report valve collar and O-ring sealing problems, so plan for a replacement O-ring in your parts box.
Why choose a side-mount tank over a top-mount
Space and plumbing run. Side-mount keeps the valve horizontal and the pipes low, which solves real problems on narrow pads and in vaulted equipment decks.
Top-mount designs are usually easier to find parts for and simpler to swap. If your pad is open and roomy, there is no strong reason to pay the premium for side-mount.
Who should skip this filter
Buy a complete assembly instead if you are starting from bare plumbing. Assembling a tank plus a separate valve plus unions is more steps and more leak points than a boxed set.
It is also the wrong pick for above-ground or small pools.
8. XtremepowerUS 425 Sq Ft Four-Element Cartridge Filter
XtremepowerUS 425 Sq. Ft. Swimming Pool Cartridge Filter, 4-Element High Flow Filter System for In-Ground & Above Ground Pools & Spas, 2-Inch Ports, Heavy-Duty Pool Water Filtration
425 sq ft across four elements
150 GPM flow rating
2 inch ports
70.4 lb
Pros
- Very high media area for large pools and spas
- 2 inch ports cut pressure loss at high flow
- Easy-open locking ring for fast service
- 10 to 15 micron particle capture
Cons
- Heaviest cartridge tank here at 70.4 lb
- Notable share of early failure reports
This is the filter to consider when the same equipment serves both a pool and a spa spillover. Four cartridges across 425 square feet, a 150 GPM flow rating, and a capacity rating up to 72,000 gallons on an eight-hour turnover is unusually generous for a residential tank.
The 2 inch inlet and outlet ports are the feature that matters most here. Larger ports reduce pressure loss, and a spa return pushes far more water than a standard pool return, so port size becomes the difference between healthy flow and a starved system.
Replacement elements use a dedicated cartridge part number, so check availability before you commit to this model if you live far from a pool store. Elements that are not interchangeable with other brands turn a cheap part into a shipping delay.
Durability is the open question. At 70.4 pounds empty it is a heavy tank, and a meaningful share of ratings sit at one star, pointing to premature failures of tank or closure components rather than filtration problems.
Is a 150 GPM rating enough for a pool with a spa
For a standard residential pool with an attached or overflow spa, that flow rating gives real headroom. High-flow returns and waterfalls are where the extra capacity pays off.
If you have a dedicated swim spa running at high speed alongside the pool, verify total combined flow before buying. A 150 GPM filter cannot push more than its rating through the media.
Who should skip this filter
Owners who prioritize a long service life over maximum media area may prefer a heavier-duty tank from a mainstream brand. The failure pattern reported here is worth weighing against the capacity gain.
Skip it also if pad weight is a concern.
9. VEVOR 200 Sq Ft Cartridge Filter
VEVOR 2026 Pro Pool Cartridge Filter System 200 sqft, Pool Filter for Inground & Above Ground Pools, Compatible W/Pumps 3HP~4HP | Up to 9827 GPH Max Flow, Pool Filters for Pools Up to 39625 Gallons
200 sq ft media area
50 micron filtration
Up to 9827 GPH
37 lb
Pros
- Connects to standard 2 inch plumbing
- Low cost against name-brand cartridge tanks
- Included connectors for a ready install
- Clears water quickly once running
Cons
- Pressure gauge sometimes inaccurate or wet
- Cartridges not interchangeable with other brands
- Some bleeder valve failures reported
The VEVOR GL720 is the value entry in this roundup. At 200 square feet of media with a filtration rate up to 9,827 GPH, the spec sheet compares favorably against tanks costing far more, and the connectors are included so the install is close to plug-and-play.
It fits straight into standard 2 inch plumbing and will happily sit on an old sand filter pad with the existing footprint. Owners converting from sand usually get clear water within days of the swap.
Two details to weigh. The media filters to 50 microns, which is coarser than the fine capture most residential cartridge filters claim, so expect slightly less polishing than a premium element. The shell is polypropylene with fiberglass at 5.2 millimeters of wall thickness, lighter than a comparable US-built tank.
The most common complaint is the pressure gauge, which some owners report arriving filled with liquid or reading inaccurately. A few also report the automatic bleeder valve shearing after a few months, so keep an eye on it early in the season.
Is a 50 micron cartridge filter good enough for a residential pool
For normal residential use, yes. Fifty microns clears leaves, grit, hair and most debris that clouds water. You lose some polish against finer media, but clarity on a normal weekly maintenance schedule is comparable.
If you chase that glassy finish or run heavy pollen seasons, a finer-rated element is worth the extra money.
Who should skip this filter
Owners who want cartridges that swap with any other brand on the market should pass. Elements are brand-specific, and that locks you into one supplier for replacement media.
If your setup depends on reliable gauge readings to time your cleaning intervals, bring a quality gauge from another source. This one is the weak link in the package.
10. Waterway Crystal Water 425 Sq Ft Cartridge Filter
Waterway 570-0425-07 Crystal Water Cartridge Filter, 425 square feet
425 sq ft filtration area
2.5 inch internal plumbing
84 lb
Four-cartridge cluster
Pros
- 2.5 inch internal path minimizes restriction
- Four-cartridge cluster stretches cleaning cycles
- Includes 2.5 inch bulkhead unions and reducers
- Easy-out cluster simplifies servicing
Cons
- Very heavy at 84 lb
- One report of tank seam cracking after warranty
Waterway builds this one around plumbing, and that is the differentiator. The 2.5 inch internal path is wider than anything else in this roundup, and it ships with 2.5 inch bulkhead unions plus 2 inch and 1.5 inch reducers so you can adapt to whatever is already on your pad.
Fewer restrictions inside the tank means lower head pressure, which means your pump moves more water and runs cooler. On a large pool with a powerful pump, that translates directly into faster turnover and clearer water.
The four-cartridge cluster extends cleaning intervals, and the easy-out design plus a multi-handle lid make servicing safer than pulling four separate elements one at a time.
The honest concern is the shell. At 84 pounds this is the heaviest tank in the roundup and needs a solid, level pad. One owner also reported the tank bottom cracking along the seam shortly after the warranty period ended, which is a failure mode worth mentioning to anyone considering this tank.
Does 2.5 inch plumbing really improve flow that much
Yes, when your pump is strong. Larger internal plumbing cuts friction loss inside the tank, and the effect is most visible with high-horsepower pumps that would otherwise be fighting the filter.
With a modest pump on a smaller pool, the difference is minor. Match the plumbing size to the pump you actually have.
Who should skip this filter
Anyone with a small equipment pad or a lightweight pad surface should look elsewhere. Eighty-four pounds empty is not a tank you casually set on an uneven slab.
It is also unnecessary for pools under roughly 20,000 gallons running a standard residential pump, where the extra flow capacity goes unused.
11. Hayward Perflex DE Filter
Hayward Perflex Diatomaceous Earth DE Swimming Pool Filter, Fast Cleaning
Patented Flex-Tube elements
Bump-handle cleaning
3-year warranty
No backwashing
Pros
- Extended-cycle Flex-Tubes clean far less often
- Bump handle clears debris in seconds
- No backwashing and no DE discharge
- Integral check valve stops backflow
Cons
- DE powder and cartridges are a recurring cost
- Some reports of DE leaking back into the pool
The Perflex is how DE filtration works without the mess people associate with it. There is no backwash cycle and nothing is discharged to the pool, yet the element captures far finer particles than sand or a standard cartridge.
The patented Flex-Tube design is the reason. Those flexible elements shed dirt as you move them, and the bump handle knocks debris off in a few seconds rather than sending several hundred gallons of water down the drain.
The integral check valve stops water from flowing back through the filter when the pump shuts off, which protects the grid pack and reduces start-up surprises. At 50 pounds with dimensions of 19.4 by 17.4 by 31.9 inches, it is compact for the filtration it delivers.
Owners consistently report the clearest water in their setups, which tracks with what DE media does. The cost is DE powder as a recurring consumable, plus a few reports of media leaking back into the pool after fitting issues at the grid.
Is DE filtration clearer than cartridge filtration
Generally yes, by a meaningful margin. DE captures down in the low micron range where sand and standard cartridges stop, which shows most in pollen season and after heavy rain.
The clarity gain is real but not free. You are trading zero water waste for powder handling, more frequent manual cleaning, and a consumable you have to buy.
Who should skip this filter
Anyone who does not want to handle DE powder should pass. Wear a mask when you open the tank, and check local disposal rules since some jurisdictions restrict where the spent powder can go.
It is also a poor match for very heavy mud or silt loads, which overwhelm the element far faster than sand handles them and can end up back in the pool.
12. Pentair FNS Plus 48 Sq Ft DE Filter
Pentair FNS Plus 48 Sq. Ft. DE Pool Filter (EC-180008)
48 sq ft DE area
Single-nut grid removal
74 lb
1-year warranty
Pros
- Large DE area per cleaning cycle
- Fiberglass-reinforced tank resists chemicals
- Service-Ease grid pack with single-nut removal
- Integrated high-flow air relief
Cons
- Valve sold separately
- DE media needs frequent manual cleaning
The FNS Plus is a professional-grade DE tank with 48 square feet of filtration area in a footprint that fits a normal equipment pad. Fiberglass-reinforced polypropylene holds up to chemical attack, and the almond-colored tank blends into a backyard rather than standing out against it.
The reason this tank earns its place is the Service-Ease grid pack. The entire grid assembly comes out on a single nut, which turns a DE service from a fiddly multi-part job into one quick removal and rinse.
The integrated continuous high-flow air relief handles the air pocket that forms as media loads, which keeps flow steady and reduces the chance of a damaged grid from a pressure spike.
Two things to note before buying. The multiport valve is sold separately, so budget for a compatible Pentair valve on top of the tank. And the warranty is one year, shorter than the three years on the Hayward DE unit, which is worth factoring into a long ownership horizon.
Is 48 square feet of DE enough for a 20,000 gallon pool
For a standard residential inground pool, that is a workable DE area that keeps cleaning cycles reasonable with a properly sized pump.
If your pool is over 25,000 gallons or you run a high-flow pump, look for a larger DE footprint such as a 60 or 75 square foot configuration instead.
Who should skip this filter
Skip it if you want a turnkey install. Tank plus valve plus unions is three separate purchases, and the one-year warranty means less long-term protection than competing DE units.
It is also the wrong choice for anyone who wants to avoid routine powder handling, since DE media needs manual cleaning far more often than a cartridge element.
How to Size a Filter for Your Inground Pool
Sizing is where most filter mistakes happen, and the confusion is understandable because pool owners usually cannot tell what size tank they already own. Start with the gallonage, then work down to flow.
Step one is pool volume. Multiply length times width times average depth in feet, then multiply by 7.5 to get gallons. If you are not confident in your measurement, our inground pool cleaner guide covers the shape-specific math.
Step two is turnover. The industry rule of thumb is that the entire pool volume should pass through the filter at least eight times in a 24-hour period. Divide your pool volume by eight to get the daily turnover target in gallons.
Step three is flow rate. Divide that daily target by 1,440 minutes to get the required gallons per minute. A 20,000 gallon pool needs roughly 111 GPM to reach eight turns, and your pump should deliver at least that at the filter’s rated speed.
Step four is media area. Cartridge filters are normally sized in square feet of pleated area, sand filters in pounds of media, and DE filters in square feet of grid area. Match the area to the flow the pump actually delivers rather than to the pool size alone.
Step five is physical fit. Confirm the connection type, union spacing, valve orientation, and pad footprint before you order, because return shipments are far more expensive than a tape measure.
Matching Your Filter to Your Pump Without Creating High Pressure
An oversized filter is not a better filter. Experienced posters on troublefreepool.com are consistent on this point, and the mechanics explain why. A filter moves water by creating a restriction, and if your pump is oversized for that restriction, head pressure climbs.
Excess pressure does three things at once. It reduces effective filtration because water finds shortcut paths instead of passing through the media, it shortens the life of the pump motor and seals, and it is the most common reason a new filter starts leaking at the valve collar within months. Several forum threads on poolspaforum.com describe exactly that collar leak, and home warranty companies have denied claims by arguing the filter was not built for the pump feeding it.
The rule that keeps this simple is that filter capacity should be sized to the pump’s rated flow, not to the biggest tank that fits on your pad. Bigger media holds more dirt, which sounds good, but only if water still moves through it at a sane rate.
Variable-speed pumps make this easier to live with. Running a pump at lower speed lowers flow, and the same filter works happily at reduced GPM. Many owners pair a variable-speed pump with a cartridge filter for exactly that reason, and you can read our pump recommendations for the models that pair well with the tanks above.
If you also have automation, check that the filter valve positions can be driven by your controller. Sand and DE backwash cycles take several minutes, and an automation system that cannot run that cycle properly is worth avoiding on a sand tank.
Filter Media Choices and What Sand Actually Works
The short answer to the most common sand question is no, you cannot use just any sand. Play sand, builder’s sand, and beach sand all lack the graded particle size that a pool filter needs, and fine or dusty media will pack into the laterals and channel straight out of the tank.
Use graded silica sand sized between 0.45 and 0.85 mm, and check that the bag says filter sand rather than masonry sand. That grading is what lets the bed fluidize evenly during backwash instead of collapsing into a solid layer.
Glass media is the common alternative. It lasts considerably longer than silica sand, resists channeling, and does not degrade into powder the way sand does. Experienced owners on r/swimmingpools increasingly recommend it for tanks already built with a sand-rated underdrain.
Zeolite media goes further than sand at catching particles below 5 microns, but it is heavier per pound, holds less volume, and needs slower backwash flow to avoid carrying out of the tank. That flow constraint is why it does not suit every pump.
Filter balls are the easiest swap of the group. You keep the same tank and valve, replace the sand with a set of balls, and cut backwash water dramatically. The trade-off is that some experienced owners on r/swimmingpools warn about media loading into the plumbing on very high flow rates, so respect the valve’s recommended settings.
Maintenance Schedule and Pressure Troubleshooting by Filter Type
All three media types share one rule: treat a 10 psi rise over your clean reading as the signal to service the filter. Note the gauge reading when the filter is clean, and that number becomes your baseline for the life of the tank.
Sand filters backwash when the gauge reads 10 psi above baseline, typically every two to four weeks in heavy debris seasons and less often otherwise. Turn the pump off, move the valve to Backwash, run until the sight glass runs clear, then rinse and return to Filter.
DE filters need manual cleaning rather than a full backwash on many designs. Remove the grid pack, rinse it, let it dry, brush off the cake, and reassemble. Perflex units with a bump handle clean in seconds without opening the tank at all.
Cartridge filters never backwash. When the gauge reads about 10 psi above baseline, turn the pump off, open the closure, pull the element, hose it from the inside out, let it dry fully, and reinstall.
When pressure climbs faster than it should, the cause is usually one of four things. A plugged skimmer or a stuck main drain valve adds suction-side restriction and makes the filter look loaded. A failing pump impeller reduces flow and lowers pressure rather than raising it, so that symptom points elsewhere. A failing valve or bad O-ring shows up as water weeping at the collar. And an undersized filter for the pump produces a permanently high reading that no amount of cleaning will fix.
If pressure is high within weeks on a brand-new cartridge, it is usually sizing rather than a defective part. That is a recurring theme in owner threads, and the fix is a larger media area or a lower pump speed, not a new element. Before you buy anything else, find out what size tank you already own by reading the model number molded into the housing or the label on the lid.
Which Pool Filter Brands Are Best for Inground Pools
Pentair and Hayward are the two names that dominate this category, and neither is better across the board. What differs is ecosystem, parts availability, and how the product ranges divide up.
Pentair tends to skew toward serviceable, professional-grade hardware. The Triton II and Sand Dollar tanks use threaded internal components, valves list explicit compatible part numbers, and the FNS Plus grid pack comes out on a single nut. That engineering shows up most when something needs repair rather than when you are shopping new.
Hayward covers more ground in the cartridge category, with the StarClear Plus and SwimClear bracketing everything from a standard residential tank to a 425 square foot quad cluster. The VariFlo valve is also one of the most widely serviced multiport valves in the industry, which matters if you ever need a quick fix.
Waterway competes on flow. The 2.5 inch internal plumbing in the Crystal Water cartridge filter is a genuine engineering advantage on high-flow setups, and the included bulkhead unions and reducers make adapting it to an existing pad straightforward.
The practical advice repeated across troublefreepool.com threads is to stay inside one brand ecosystem where you can. Matching unions, valves, and fittings from the same manufacturer means parts are interchangeable and a service call does not turn into a scavenger hunt. If your existing equipment is Pentair, a Pentair filter is usually the least troublesome path.
For pools with salt systems, choose corrosion resistance over media type. Molded polymeric bodies handle salt exposure better than metal components, and a cartridge filter is a sensible companion to a salt chlorine generator because neither adds metals to the water. Owners considering a salt setup can compare our saltwater system guide for the equipment side.
If you are upgrading the whole yard, lighting and circulation are separate purchases with their own sizing logic. Our inground pool light picks and robotic cleaner guide cover those decisions.
Frequently Asked Questions
Is Pentair or Hayward better?
Both are dependable, well-supported manufacturers and the better choice depends on your equipment. Pentair leans toward serviceable, professional-grade hardware with threaded internals and explicit valve compatibility. Hayward covers more cartridge capacity options and its VariFlo valve is widely serviced. Staying within one brand ecosystem keeps unions and valves interchangeable.
Is a sand filter or cartridge better?
Cartridge filters suit most residential inground pools because they never discharge water and clean with a hose in minutes. Sand filters win on heavy debris loads and low upfront cost because far more media fits in the tank by weight, but they backwash several hundred gallons of water each cycle and send that water down the drain.
Can I use any sand for a pool filter?
No. Use graded filter silica sand sized between 0.45 and 0.85 mm. Play sand, builder’s sand and beach sand are not graded for filtration and will pack the laterals or channel out of the tank. Glass media is a durable alternative, and filter balls can replace sand in most existing sand tanks.
What size filter and pump do I need for my pool?
Calculate pool volume, then divide by eight to get the daily turnover target. Divide that by 1,440 minutes to find the required GPM. A 20,000 gallon pool needs roughly 111 GPM for eight turns per day. Size filter media to the flow your pump actually delivers rather than to the largest tank that fits your pad.
Why is my DE filter pressure so high?
Most often the grid pack is loaded and needs manual cleaning, which is normal on DE systems. Other causes include a clogged skimmer or closed main drain adding suction-side restriction, a leaking valve collar or O-ring, and an undersized filter for your pump. If pressure climbs within weeks on a new cartridge, sizing is usually the issue rather than a defective part.
Final Verdict on the Best Pool Filter Systems for Inground Pools
For most inground pool owners, the Hayward StarClear Plus is the best pool filter system in this roundup. It pairs a proven 120 square foot cartridge with a single-knob closure, no backwashing, and the largest owner review base here, and that combination of clarity and low maintenance is very hard to beat for a standard residential pool.
If your pool is large or your debris load is heavy, step up to the SwimClear 425 for season-long cycles. If you would rather backwash and stop thinking about cartridges, the XtremepowerUS 22 inch sand filter holds a remarkable amount of media for the money. And if water clarity at the finest level matters more than convenience, the Hayward Perflex gives you DE filtration without any backwash discharge.
Get the sizing right before you order. A filter matched to your pump’s real flow will run cool and clean for years, while one that is too large will fight you every season. Check your existing plumbing, measure your pad, and note your clean baseline pressure reading on the day you install.
Updated for October 2026, and we will keep revising it as new tank models land.