3M 4US-MAXL-S01H Quick Change Single Stage Drinking Water Filter System High performance drinking water system, single stage, includes dedicated faucet for better tasting, healthier water to keep you and your family safe. One filter does the work of a traditional 2-stage under sink water filtration systems. Quick-change filter design for easy and mess free filter changes - no need to turn off your water supply Reduces chlorine taste and odor, sediment, rust, sand and dirt Uses 4US-MAXL-F01H replacement water filter 25% faster flow rate than comparable under sink drinking water filtration systems - tested and certified by NSF