Use the replacement filters with the ZeroWater 10 or 23-cup pitchers to remove 99.6% of water impurities. These filters remove virtually all the dissolved solids from your home’s tap water to provide the best possible taste for your family. Use the ZeroWater Replacement Filters to make sure your ZeroWater pitcher can continue to provide you with the cleanest and freshest tasting water. 5-stage ion exchange filter. Removes 99.6% of all dissolved solids. Only pour-through filter certified to reduce lead and chromium. Each filter lasts for 25 gallons. Includes four filters. BPA free. NSF certified for removal of lead, chromium and mercury.