Pentair Pool Filter Cartridge: Sizes, Parts, and Costs

Pentair filters hold their value on pool equipment pads for a long time, which is exactly why so many owners end up hunting for a pentair pool filter cartridge years after whoever installed the system has moved on. The tank is fine. The manual is gone. The element inside is grey, matted, and no longer responds to a rinse. What follows is the practical version of that lookup: how Pentair names its filters, which element goes in which tank, what the aftermarket equivalents actually are, and what the whole thing costs across a few seasons.

Which Cartridge Fits Your Pentair Filter?

The model name and square footage printed on the tank label determine the element. Nothing else does, not the pump horsepower, not the pool gallons, not the year it was installed.

Two families cover most residential installs. Clean and Clear filters use a single large cartridge standing in the middle of the tank, sized from roughly 100 to 420 square feet. Clean and Clear Plus and Quad units use a four-element set arranged around a center manifold, sized from roughly 240 to 520 square feet total. So the first question is never “what size cartridge do I need” but “does my tank take one element or four.”

Find the label. It is usually a sticker or moulded panel on the filter body near the top, or on the lid, and it reads something like “Clean and Clear 200” or “Clean and Clear Plus 320.” That number is the total square footage. Match it, count the elements when you open the lid, and you have your answer. If the tank label is long gone, open the filter and measure the cartridge before ordering anything, because the same square footage can appear in more than one housing generation.

Pentair Cartridge Cross-Reference Table

The table below covers the common residential pentair pool filter cartridges and the usual aftermarket equivalents. Treat every part number here as a starting point rather than a purchase order. Pentair revises part numbers between production runs, and aftermarket makers occasionally re-map their own catalogue numbers, so confirm against the label on your housing and the current parts list before you buy.

The pentair 178580 cartridge line in that table is the one people search for most, because the Clean and Clear Plus 240 is a common residential size and the number is stamped where owners can find it. Note that it refers to a set of four 60 square foot elements, not one cartridge. Sellers list both ways, so read the listing quantity carefully before checkout.

If you are unsure whether your existing filter is even the right size for your pool, our guide to what size cartridge filter you need works through the turnover math, and the broader Pentair pool filter guide covers how the Clean and Clear range fits alongside Pentair’s sand and DE tanks.

Single Cartridge vs Four-Element Sets

The practical difference between a single-element pentair cartridge pool filter and a four-element unit shows up at replacement time.

With a single-cartridge Clean and Clear, replacement is simple. One element comes out, one goes in, and the whole filter surface is new at once. With a Clean and Clear Plus or a Quad, the four elements act as one continuous filter surface. Water takes the path of least resistance, so if you drop one fresh cartridge in beside three loaded ones, a disproportionate share of the flow runs through the new element. It packs with debris quickly, while the three older ones keep restricting flow and never get properly relieved.

The result is uneven flow, a filter that never really recovers its clean starting pressure, and a new cartridge that wears out well ahead of schedule. Replace all four together, keep them on the same rotation, and mark the install date on the manifold with a paint pen so the next person is not guessing.

One more habit worth building on four-element units: when you pull the set for cleaning, put each element back in the same position. Cartridges bed in slightly differently depending on where they sit relative to the inlet, and keeping them in place helps the set wear evenly.

OEM vs Aftermarket

A genuine pentair replacement cartridge and a good aftermarket element are closer than the price gap suggests, but the gap between a good aftermarket element and a cheap one is enormous.

Pentair OEM parts give you guaranteed fit, the stated media area, and no argument if something goes wrong under a warranty claim on the filter itself. Established aftermarket makers, principally Pleatco and Unicel, build to the same dimensional spec and usually land 20 to 40 percent below OEM pricing. Owners running those brands for years generally report similar service life. Below that tier, the economics stop working.

Four things to check before you buy any non-OEM element:

• Stated square footage. It should match the OEM figure exactly, not “approximately” or “up to.” Inflated area claims are the most common shortcut.
• Pleat count. Fewer, deeper pleats means less real surface and faster clogging. Compare against the OEM element you pulled out.
• End cap fit. The caps should be rigid moulded plastic that seats squarely on the manifold with no rocking. Thin or flexible caps distort under pressure and let water bypass the media.
• Media weight and feel. Quality polyester feels dense and slightly stiff. Papery, floppy media packs down and tears at the folds within a season.

For a shortlist of elements that hold up across the major filter brands, see our roundup of the best pool filter cartridge replacement options.

It is worth comparing current pricing on both before committing to OEM.

Check Pentair Cartridge Prices on Amazon

Pentair Cartridge Lifespan and Cost

A pentair clean and clear cartridge typically lasts 1 to 3 years. The wide range is not vagueness, it reflects how much of the outcome sits with the owner and the sizing. A properly sized filter that gets rinsed a few times a season and a proper deep clean once a year commonly reaches the top of that range. An undersized filter on a busy pool that fights an algae bloom every August lands at the bottom.

On cost, budget realistically. Single elements for Clean and Clear tanks generally run 60 to 130 dollars depending on size and brand. Four-element sets for a clean and clear plus cartridge unit run 200 to 450 dollars, which is why the temptation to replace one at a time is so strong and why it is still the wrong move. Spread over a 2 to 3 year life, even the 450 dollar set works out to a modest annual line item next to chemicals and electricity.

The signs an element is finished are consistent. Filter pressure climbs back to the dirty mark within days of a clean rather than weeks. The pleats stay grey and matted after a proper soak. The media feels hard or brittle, or you find split folds and cracked end caps. Water clarity slips even with chemistry in range. Any two of those together and the element is done. Our guide on when to replace a pool filter cartridge walks through each signal and how to tell a dirty cartridge from a dead one.

If you are pricing a full swap, checking current listings for pool filter cartridge replacement sets is the fastest way to see whether a four-element set is worth buying as a bundle.

Cleaning to Extend Life

Regular cleaning is the single biggest lever on how long a pentair pool cartridge filter element survives, and it is straightforward once you know the technique. The short version: rinse when pressure rises 8 to 10 psi above the clean baseline, work the spray into each pleat rather than across the face, and deep soak in a proper cartridge cleaner at least once a season to strip oils and scale that a hose cannot touch. Skip the pressure washer, which drives debris into the media and tears pleats.

Full step by step method, including soak times and the mistakes that wreck good cartridges, is in how to clean a cartridge pool filter. For opening the tank, handling the manifold, and reassembling the clamp band on a Pentair unit specifically, see cleaning a Pentair pool filter.

Related Guides

• Pentair Pool Filter Guide - the full Pentair range and how the models compare
• Cleaning a Pentair Pool Filter - tank opening, manifold handling, and clamp band reassembly
• How to Clean a Cartridge Pool Filter - rinse and deep soak method for polyester media
• When to Replace a Pool Filter Cartridge - the signals that an element is finished
• Best Pool Filter Cartridge Replacement - OEM and aftermarket elements worth buying
• What Size Cartridge Filter Do I Need? - turnover math and sizing before you buy