had this for 3 years, it's rated for 6 year/600,000 gallons. only 2 people in our house so these have at least 3 years left. my wife wanted a water softener so no longer needed these. if you dont have access to power or a drain, or if you dont like the feel of soft water this is a good system for you. comes with the prefilter and filters. I'm a plumber so I can walk you through how it works and how to hook it up.