The 3M Aqua-Pure AP903 is a whole house water filter system which is one of the best single cartridge whole house water filter systems on the entire water filter market. The 3M Aqua-Pure AP903 features high flow rates up to 20 gallons per minute (GPM) using 1″ FNPT inlet/outlet water line connections.
via 3M Aqua-Pure AP903 Whole House Water Filter System Only $215.