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We offer over 200 of the most popular replacement filter cartridges on the market, including replacements for Unicel, Filbur, Pleatco, and OEM products. To find your filter by selecting the dimensions below.
Watch the video for advice on how to measure your cartridge.

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4H8-158 Pool Filter Cartridge

Guardian Filtration

Replaces: Unicel 4CH-21 Pleatco PTL18P4 Filbur FC-0121

$29.99 $19.99


Genuine product manufactured by:

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