This 4 1/2 IN x 10 IN clear empty refillable cartridge is made of high grade FDA listed polypropylene. End cap gaskets are constructed of EPDM material. Screw on/off cap for easy filling and removing of media. 50 micron filter pad to prevent migration of media from filter. This filter will fit all the standard 20 IN filter housings. The minimum water pressure required is 20 psi with the maximum of 125 psi and the maximum temperature rating of 100 degrees F (38 degrees C). Features Screw on/off cap for easy filling and removing of media Canister bodies made of high grade FDA polypropylene End caps are constructed of EPDM material Use with granular activated carbon, DI resin, mixed bed ion exchange resins, or water softening media