These official Lay-Z-Spa high quality filter cartridges help keep your hot tub water clean, clear and safe. Maintains water hygiene by filtering out dirt and grime whilst optimising pump performance. Helps protect the pump and heater from debris to prolong lifespan. For use in conjunction with regular chlorine maintenance.Please note: lifestyle photographs for illustration, 1x product listed supplied only. Please read all packaging and instructions thoroughly before use.