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Pool filters: the consumable nobody budgets for

Filtration is where a cheap pool quietly becomes expensive. Cartridges are a recurring cost and almost nobody counts them.

By Sawyer V., enthusiastLast updated
A pool filter cartridge unit

Heads up: we earn a commission if you buy through the links on this page, at no extra cost to you. It never decides the ranking — here is how we pick and here is the full disclosure. Prices are checked automatically; last verified January 1, 1970.

Quick picks

Segmented before it is ranked — the right answer depends on which of these you actually are. Tap any row for the full write-up.

The consumable you will buy repeatedly

Buy a multipack before you need one. A pool running on a spent cartridge is a cloudy pool.

#ProductBest forScorePrice
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Type A Replacement Filter Cartridges (multipack)

Buy them in a multipack before you need them. A pool running on an exhausted cartridge is a cloudy pool, and the fix is a two-dollar part you did not have.

The consumable you will actually buy repeatedlyOne honest season8.2out of 10
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Intex Krystal Clear C1000 Cartridge Filter Pump

The workhorse replacement pump for mid-size frame pools. 1,000 GPH pump flow, 750 GPH through the system once the cartridge is in the way — and that second number is the one your turnover math needs.

Pools up to about 6,000 gallonsSeveral seasons8.3out of 10
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Getting off the cartridge treadmill

Sand media lasts years rather than weeks. The payback depends on how long you keep the pool.

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Intex Krystal Clear Sand Filter Pump

Sand filtration replaces a recurring cartridge purchase with a backwash valve and a bag of sand that lasts years. On a pool you intend to keep, the arithmetic favors it.

Getting off the cartridge treadmillSeveral seasons8.4out of 10
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The short version

  • Intex’s own guidance is cartridge replacement roughly every two weeks in heavy use. Almost nobody budgets for that.
  • Rinsing extends life; it does not restore a spent cartridge. Gray, stiff pleats after rinsing means it is done.
  • Type A is the most widely stocked format in the US. That matters in July.
  • Keep a spare. A cloudy week is often a two-dollar part you did not have.

The recurring cost nobody counts

When people budget for a pool they count the pool, the chemicals and sometimes the electricity. Filter cartridges get missed almost universally, and across a season they are a real line.

Intex’s guidance for Type A cartridges is replacement roughly every two weeks in heavy use, with rinsing between. On a 17-week season that is a meaningful quantity, and it is the single strongest argument for a sand filter on any pool you plan to keep for several years.

What loads a cartridge fastest. All of these shorten the interval below the two-week guideline.
FactorEffectWhat to do
Heavy bather loadSunscreen and body oils clog pleatsRinse after busy weekends
Dogs in the poolHair loads it fastExpect to replace sooner
After vacuumingOne session can load a cartridgeClean immediately after
After shockingFine oxidized particulateRinse once the water clears
Nearby treesConstant organic loadSkim more, not filter harder
What loads a cartridge fastest. All of these shorten the interval below the two-week guideline.

Rinsing versus replacing

Rinsing is genuinely worth doing and it does not do what people hope. It removes the surface debris sitting between the pleats, which restores flow. It does not remove the oils and fine particulate that have worked into the fiber, which is what eventually finishes a cartridge.

The test is simple. Rinse it thoroughly, let it dry, and look at it. If the pleats come back to something near their original color and feel flexible, it has more life. If they stay gray and stiff, it is spent, and running the pool on it is why the water is not clearing.

Do not scrub it with a brush and do not use a pressure washer at close range. Both damage the pleat material and destroy the cartridge faster than use does.

Type A, and why format availability matters

Intex’s Type A is the most widely stocked filter cartridge format in the US, available from Intex and from a large aftermarket. That is not a technical advantage — it is a practical one, and in July when the pool is cloudy and the store is twenty minutes away it is the only one that matters.

Aftermarket quality does vary. A cheap cartridge with less pleat area filters less per pass and needs replacing sooner, so the saving is often illusory. Compare pleat count if the listing gives it.

When to switch to sand

The arithmetic is a straight comparison: cartridges consumed per season, against one bag of sand every few years, plus the water each backwash discards at $6.06 per 1,000 gallons.

On a pool you will own for three or more seasons, sand generally wins. On a pool that comes down every autumn and might not go back up, it does not — the payback period never arrives. The full comparison, including the maintenance differences, is at sand versus cartridge.

The picks, in full

Scores are our own reading of published specifications. They are not test results — we have not tested these products and we do not claim to.

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Pick #1 · The consumable you will actually buy repeatedly

Type A Replacement Filter Cartridges (multipack)

Various

Buy them in a multipack before you need them. A pool running on an exhausted cartridge is a cloudy pool, and the fix is a two-dollar part you did not have.

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Key specs

Type
Type A — the most common Intex format
Replacement interval
Every 2 weeks in heavy use, per Intex guidance
Between changes
Rinse, do not scrub

How it scoresour reading of published specs, not a test result

Sizing fit
9.0
Running cost
7.0
Maintenance
8.5
Build
7.0
Value
8.5

Overall 8.2 / 10

What works

  • Type A is the most widely stocked cartridge format in the US
  • Multipacks cost a fraction of buying singles
  • Having a spare turns a cloudy week into a five-minute fix

What doesn't

  • It is a genuine recurring cost that nobody includes in the purchase price
  • Aftermarket quality varies noticeably
  • Rinsing extends life but does not restore a cartridge that is done

Skip it if: Being restored. Once the pleats are permanently gray and stiff, rinsing is not saving it.

What it costs to run: The line item most people leave out of their pool budget. Count how many you use in your first season and you have your real annual filtration cost — this is exactly the number the cost-to-run guide asks you to record.

One honest season: The cheapest setup that genuinely works for a season of real swimming. Nothing spare, nothing missing.

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Pick #2 · Pools up to about 6,000 gallons

Intex Krystal Clear C1000 Cartridge Filter Pump

Intex

The workhorse replacement pump for mid-size frame pools. 1,000 GPH pump flow, 750 GPH through the system once the cartridge is in the way — and that second number is the one your turnover math needs.

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Key specs

Pump flow rate
1,000 GPH
System flow rate
750 GPH
Rated pool size
Up to 6,000 gallons
Cartridge
Type A
Wattage
Not published by Intex

How it scoresour reading of published specs, not a test result

Sizing fit
9.0
Running cost
7.0
Maintenance
7.5
Build
7.5
Value
8.5

Overall 8.3 / 10

What works

  • Intex publishes both pump flow and system flow, which is more honesty than most of this category offers
  • Type A cartridges are the most widely stocked filter consumable in the US
  • Sized correctly for the 12ft-15ft frame pools most families own

What doesn't

  • Wattage is not published anywhere on the Intex site, so you cannot cost it before purchase
  • Cartridge-only, so there is a consumable every few weeks in a busy pool
  • GFCI cord length dictates where the pool can go more than people expect

Skip it if: Pools over about 6,000 gallons. Above that you are asking it to run all day to achieve one turnover, which is the expensive way to filter.

What it costs to run: Do the turnover math before you buy: 750 GPH system flow moves 4,000 gallons in 5.3 hours. Two turnovers a day is therefore about 11 hours of running. At the EIA's June 2026 US residential average of 18.34 cents per kWh, every 100 watts of pump draw running 11 hours a day for a 120-day season costs about $24. Find your wattage on the pump label and multiply.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: Intex — Krystal Clear cartridge filter pumps, EIA Electric Power Monthly, Table 5.6.A — US residential average price

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Pick #3 · Getting off the cartridge treadmill

Intex Krystal Clear Sand Filter Pump

Intex

Sand filtration replaces a recurring cartridge purchase with a backwash valve and a bag of sand that lasts years. On a pool you intend to keep, the arithmetic favors it.

Check price on Amazon

#ad how this is funded

Key specs

Media
Filter sand (or glass media)
Maintenance
Backwash rather than rinse-and-replace
Media life
Several seasons before replacement
Wattage
Not published by Intex

How it scoresour reading of published specs, not a test result

Sizing fit
8.5
Running cost
8.0
Maintenance
8.5
Build
8.0
Value
8.5

Overall 8.4 / 10

What works

  • No cartridges to buy, which removes the single largest recurring equipment cost
  • Backwashing takes about two minutes versus rinsing a cartridge in the yard
  • Sand lasts years rather than weeks

What doesn't

  • Backwashing sends water down the drain, and that water has chemicals in it you paid for
  • Higher purchase price than a cartridge pump of the same flow
  • Heavier and needs a stable, level base of its own

Skip it if: A small seasonal pool that comes down every autumn. The payback period is measured in seasons, so it only works if there will be seasons.

What it costs to run: The comparison to run: cartridge replacements per season versus one bag of sand every few years, plus the water each backwash discards at the EPA WaterSense average of $6.06 per 1,000 gallons. On a pool you will own for three or more years, sand usually wins.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: EPA WaterSense — cost per 1,000 gallons

Questions people actually ask

How often should I change my pool filter cartridge?
Intex’s guidance is roughly every two weeks in heavy use, with rinsing between changes. Heavy bather loads, dogs in the pool, a vacuuming session and a shock treatment all shorten that interval. The test is to rinse it, dry it and look at it: if the pleats stay gray and stiff, it is spent.
Can you clean and reuse a pool filter cartridge?
Rinsing restores flow by removing surface debris between the pleats, and it is worth doing regularly. What it cannot remove is the oils and fine particulate worked into the fiber, which is what eventually finishes the cartridge. Do not scrub with a brush or use a pressure washer at close range — both damage the pleat material.
Why is my pool cloudy even though the filter is running?
Most often a spent cartridge. Check the flow at the return jet: if it is visibly weaker than it was, rinse the cartridge, and if rinsing does not restore it, the cartridge is done. If flow is good and chemistry reads correct, the cause is elsewhere — work through the cloudy water decision tree rather than adding more chemicals.

Sources

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