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

or voltage than listed above

Easy to use and ideal for spas with mineral systems

Armor Shield also reduces convective heat loss and provides a comfortable floor pad for the comfort of pool goers

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