Brita’s Ultra water system not only improves the flavor of tap water for drinking and cooking, it also purifies it. Brita packages two replacement water filters together to ensure that your water filter continues to function properly and that great-tasting water keeps flowing. Contaminants such as asbestos, cryptosporidium, and giardia are removed–as long as the filter is changed regularly. These filters fit readily on the Brita Ultra Faucet Filter, which is sold separately. –Lynne Sampson Product Description Brita On Tap Replacement Filters-2ct Brita On Tap filtration system attaches easily to your faucet without tools, and the convenient and economical filter lasts for approximately 100 gallons or 4 months. Replacement filter easily snaps onto Brita faucet mount system and makes tap water taste great. The electronic LED filter replacement indicator flashes red when the filter should be replaced. Keep cleaner, great-tasting water on tap for families, kitchens and cooking. 4 ct. per package.