Replacement filter pack for Aquasana Claryum Countertop Water Filtration System (AQ-4000). Includes one of each filter type. Not compatible with under sink filter systems.Not compatible with Clean Water Machine. Use genuine, Aquasana replacements only - Non Aquasana brand replacements are not certified for performance capacity or contaminant removal Replacements made easy - no tools or plumber required. Simply twist, remove, and replace Only 11 cents per gallon - 11 times the capacity of the leading gravity-based filter pitcher Retains the healthy minerals like calcium, potassium, and magnesium - the healthiest drinking water for you and your family WQA Certified to NSF/ANSI Standards 42, 53 (includes P473), and 401 to remove 99% of 77 contaminants including lead, mercury, pesticides, pharmaceuticals, and more