Unicel C-4402 Replacement Filter Cartridge for Aqua Spa | 20 Sq. Ft. | 9¾" Interactive Play After testing your phosphate levels

After testing your phosphate levels

Waterway Plastics Crystal Water 425 sq

Includes deck platform

Contains specialized clarifiers

3-«" Shaft Height

Unicel C-4402 Replacement Filter Cartridge for Aqua Spa | 20 Sq. Ft. | 9¾" Interactive Play After testing your phosphate levelsThe Unicel C 4402 delivers 20 square feet of filtration area in a compact 9" spa cartridge built for Aqua Spa filter systems. Constructed with 4 oz. Reemay 2040 spunbond polyester media across 138 precision pleats, it provides thorough debris capture and reliable flow performance. The molded cone handle top cap and slotted open bottom are engineered to seat securely in compatible Aqua Spa housings. Compatibility Note This cartridge is listed as