Product Description Replacement filter for the Aquasana 1-Stage Under Counter Water Filter System. Replace filter once every 6 months for continued system performance. Use only genuine Aquasana replacements - untested replacements are not certified for performance capacity or contaminant removal. Instant access to healthy water that keeps you and your family hydrated all day, every day. Reduces up to 99% of 78 contaminants including lead, mercury, asbestos, pesticides, pharmaceuticals, chlorine, chloramines, microplastics, and more. Full system WQA tested & certified to NSF/ANSI Standards 42, 53, (includes P473), and 401. The only system on the market with Claryum filtration technology that filters out harmful contaminants while retaining natural beneficial minerals like calcium, magnesium and potassium. Healthy water at only 13 cents per gallon - 5 times the capacity of the leading gravity filter pitcher. Zero additives and zero waste - no water is wasted during the filtration process and no harmful contaminants are added back into the water. Drink healthier water and use for better tasting beverages like coffee, tea, and smoothies. Enjoy better tasting food - steamed vegetables, rice, boiled pasta, soups. Even your pet can now benefit from healthier water. Replacements are a simple twist - keep your plastic housing and only toss the filter. From the Manufacturer Replacement filter cartridge for the Aquasana Single-Stage under counter (under sink) drinking water filter system model numbers: AQ-5100, AQ-5100.56.