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Unicel C 4401 35 sq ft Spa Filter Cartridge Type_Cover Lifter all but eliminating the frustrating all but eliminating the frustrating "pH bounce" that has owners chasing the same reading up and down week after week The tablets dissolve completely without leaving cloudy or insoluble residue Where most spa cartridges use a 3 oz fabric The Unicel C 4401 delivers 35 square feet of filtration across 158 pleats of heavyweight 4 oz Reemay® 2040 polyester media
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