Aquifer(tm) high-flow refill filter cartridge This Aquifer high-flow refill filter cartridge with single-stage filtration and absorption system reduces particulates, dirt, rust, chlorine, cysts and turbidity, and features high-impact, plastic construction with stainless steel fittings and hoses for increased durability. 1/4 turn quick-change, no-spill filter cartridge NSF-compliant NOTE: Video Content Provided by Kohler