Unicel C-4320 20 square foot replacement pool filter cartridgeUnicel C-4320 Cartridge, 20 Sq. Ft. In stock$2999
Unicel C-4320 20 square foot replacement pool filter cartridge
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Unicel C-4320 Cartridge, 20 Sq. Ft.

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$2999
In stock
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Quick overview

  • Unicel C-4320 Order by the Unicel number, which pins down the size and the end configuration together.
  • 20 square feet of media The filtration area of this cartridge, the figure to match against the one it replaces.
  • 4-5/8 in. outside diameter Measure the old cartridge across the end before ordering.
  • 11-7/8 in. long The second dimension to check, since cartridges of the same diameter come in several lengths.
  • In-line cartridge size A compact cartridge of the size used in small in-line filter housings.
  • Rinse and replace Cartridges are cleaned between changes and replaced when the pleats stay grey or the media goes soft.
Full description and specifications ↓

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Product details

The Unicel C-4320 is a replacement pool filter cartridge rated at 20 square feet. It measures 4-5/8 inches across the outside diameter and 11-7/8 inches long.

Match it by the numbers

Cartridges are identified by diameter, length, area and end configuration, and several of them look nearly identical on a shelf. Pull the old element, measure it, and match the Unicel part number. That is faster and more reliable than trying to work back from the filter housing model, particularly on equipment that has been swapped around over the years.

Cleaning against replacing

A cartridge is cleaned when filter pressure climbs above its clean starting point, and replaced when cleaning stops working. Pleats that stay grey after a proper soak and rinse, media that feels soft, or splits at the folds all mean the element is finished, no matter how it looks from a distance.

Check the quantity

This is one cartridge. Some housings hold a single element and others hold several, so count what you take out.

Specifications
Brand Unicel
Manufacturer part number C-4320
UPC 678285140126
Type Replacement filter cartridge
Square footage 20
Outside diameter 4-5/8"
Length 11-7/8"
Filter manufacturer Pentair
Shipping weight 0.96 lb
Ships Parcel

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Customer reviews

Questions and answers

What people ask about this product, answered by our pool techs.

What are the dimensions?
4-5/8 inches outside diameter by 11-7/8 inches long, rated at 20 square feet.
Which filter is it for?
Our source data lists the filter manufacturer as Pentair, while the same part is also grouped with Hayward® Microstar Clear filter parts. Measure the cartridge you are replacing and match the Unicel number rather than going by brand alone.
How do I know when to replace rather than clean?
Clean a cartridge when pressure climbs. Replace it when a proper clean no longer brings pressure back down, when the pleats stay discolored, or when the media has gone limp or split at the folds.
Is one cartridge enough?
This listing is a single cartridge. Some filter housings take more than one, so count what came out of yours before ordering.
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