ZeroWater 4-Pack Replacement Filter Cartridges ZR-004 ZEROWATER REPLACEMENT FILTERS: Ensures pure-tasting, cleaner water. It fits in all ZeroWater pitchers and water dispensers, from the smallest pitcher to the largest. FIVE STAGE WATER FILTRATION: Unlike many water filters & pitchers, ZeroWater filters use 5 stages of filtration, to bring you cleaner, better tasting water. Instead of carbon filtering only, our filters use Ion Exchange Technology to reduce contaminants. NSF CERTIFIED: ZeroWater filters are certified to reduce lead and other heavy metals. Zerowater removes 99.6% of total dissolved solids, 2X more than the leading brand (tested by independent lab). GET MORE OUT OF YOUR WATER: With a variety of options, you can have cleaner water anywhere, from pitchers, bottle filtration systems, or portable on-the-go cup filters. ZEROWATER QUALITY: Some ZeroWater filters are compatible with other brands of water pitchers. Try switching to ZeroWater if you have used water filters or pitchers from Brita, Pur, Aquagear, Nakii, Waterdrop, Kenmore, Berkey, Fridgidaire, or Aquasana.