For use only with K-200, K-6665-f, and K-6666-f, replaces k-201 and k-202 filters Filter reduces particulates, sediment/rust, turbidity, cysts, chlorine taste/odor, and lead Meets NSF international standards Cartridge filter can be twisted in and out for easy replacement, replace filter media every 1, 389 gallons (5258 l) or six months Single-stage filtration and absorption system