The Lay-Z-Spa Filter Cartridge (Vi) Can Be Used With Any Lay-Z-Spa Pump,Keep Pool Water Clean And Healthy; Prevent The Build-Up Of Grime And Dirt,Filter Out Dirt And Grime; The Lay-Z-Spa Filter Cartridge, The Perfect Hot Tub Accessory For Maintaining Your Spa,Easy To Clean And Install; These Hot Tub Filter Cartridges Are Lightweight And Simple To Attach