This is the 20 square foot DE filter module used in the Pentair 80 square foot, Quad DE filter, #188593.
This resembles a filter cartridge but is actually used with DE powder for the most efficient filtration possible in a swimming pool system.
There are 4 of these used in a filter. This is a Unicel high quality, lower cost replacement for the original Pentair part number 178655.
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