Hurricane HF4637-01 Premium Spa Filter Cartridge for Pleatco PRB37-IN air relief valves delivering continuous ORP readings to

delivering continuous ORP readings to optimize sanitizer dosing automatically

it helps you organize faster and keep clutter out of sight

Broad compatibility with residential filters: Engineered to work with common cartridge filter configurations in homes and small pools

no electrical current runs to the button itself

and hot tubs

Hurricane HF4637-01 Premium Spa Filter Cartridge for Pleatco PRB37-IN air relief valves delivering continuous ORP readings toHurricane HF4637 01 Premium Spa Filter Cartridge Drop in replacement filter cartridge delivering 37 square feet of spa filtration for systems that require Pleatco PRB37 IN. Compatible with Pleatco PRB37 IN, Unicel C 4637, Filbur FC 2380, Rainbow Dynamic 37 (Series IIV RTL 25), Leisure Bay Spas, Morgan Spas, and Waterway housings. Exclusive turquoise end caps signal Hurricane quality and USA made construction. Replacement compatibility: Replaces