Unicel C-4401 | 35 sq ft Spa Filter Cartridge Type_Pellet Grill The XL holds more pre-filled

The XL holds more pre-filled chlorine and is calibrated to release at a rate that matches the larger water volume — which is the difference between a pool that stays clear and one that fights cloudiness all season

It screws straight onto a standard garden hose — no plumbing

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Gently push cover towards the back of the spa and lift over

Unicel C-4401 | 35 sq ft Spa Filter Cartridge Type_Pellet Grill The XL holds more pre-filledThe Unicel C 4401 delivers 35 square feet of filtration across 158 pleats of heavyweight 4 oz Reemay 2040 polyester media. Built to meet or exceed OEM specifications, it's the compact replacement cartridge for Pentair, Rainbow Dynamic Series IV, and Waterway skim filter systems. Filtration is the quiet backbone of clean spa water. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge is what removes all of it before it