Unicel 4CH-20 Replacement Filter Cartridge | 20 sq. ft. | 1-1/2" MPT Bottom C9478 When installing

When installing

An invisible liquid barrier that conserves water and heat

Perfect for use on concrete

Shaft seal assembly

Reemay 2040 Pleat Count 115 Top Cap: open

Unicel 4CH-20 Replacement Filter Cartridge | 20 sq. ft. | 1-1/2" MPT Bottom C9478 When installingThe Unicel 4000 Series 4CH 20 is a 20 sq. ft. replacement filter cartridge built for top load spa skimmer systems. Its 1 1 2" male threaded (MPT) bottom connection makes it a direct thread replacement for a wide range of spa filter housings no adapter required in most applications. With 204 precision pleated panels of 3 oz. Reemay 2033 spunbond polyester media, this cartridge delivers consistent filtration performance and extended media life.