Works with Unicel C-8417, Pleatco PA175, Filbur FC-1294, Hayward Star-Clear Plus C-1750, Pro Clear 175, and Posi Clear PXC 175. Compatible with: Sta Rite PXC 150, Waterway Pro Clean 150 . Equipped with evenly spaced holes in the center core and is made to filter a 175 square feet area.
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