Aquasana Replacement Filter Cartridges for 2-Stage Under Sink Water Filtration System Replacement filter pack for Aquasana 2-stage under sink water filtration system: AQ-5200.55, AQ-5200.56, AQ-5200.62 Use genuine Aquasana replacements only - untested replacements are not certified for performance capacity or contaminant removal One of the longest lasting filters on the market - 10,000 gallons or six months of fresh water. Less than $0.10 per gallon. Filters 320 gallons. Change filters every 3 months - 8x the capacity of leading gravity pitchers Powered Active Filtration - obsessively engineered to remove over 96% of over 77 contaminants including chlorine and lead Replacements made easy - no tools or plumber required. Simply twist, remove, and replace