Non genuine Cartridge insert for Stroud/Monarch Clearflow P4-100 for 100sq foot unit. Size of this insert is 500mm x 185mm x 75mm **Please check your measurements as well as the information on the cartridge filter, as we cannot accept responsibility for incorrect orders. We will accept returns of cartridges in original box and condition but postage will be at the customers expense. *PHOTO IS FOR ILLUSTRATION PURPOSES ONLY