Unicel 4CH-925 | 20 sq ft Strong Spas Filter Cartridge Brand_Spa Marvel and chemical residue out of

and chemical residue out of the lines so you can start your fresh fill on a genuinely clean system

part number 812-3811

Pro Tip: Purge even a brand-new hot tub

and unfiltered water will bypass the media entirely

Unicel 4CH-925 | 20 sq ft Strong Spas Filter Cartridge Brand_Spa Marvel and chemical residue out ofThe Unicel 4CH 925 is a compact 20 square foot top load replacement cartridge for select Strong Spas and Futura Antigua models. At just 7 1 4" tall and 4 5 8" across, it is one of the smallest threaded cartridges Unicel builds and it packs 190 pleats into that short body, the densest fold per inch of any cartridge in its diameter class. The bottom carries an injection molded 1 1 2" SAE thread, with a semi circular handle across the closed top. Molding