Keep your spa water clean and clear with this twin pack of Bestway's flow-clear hot tub spa filter cartridges. These replacement cartridges are made from thin paper for filtering out unwanted dirt and grime whilst optimizing pump performance. The cartridges help protect your pump and heater from dirt, which could cause damage and reduce their lifespan. These hot tub filters are easily maintained and reusable. For best use, clean and change your filters after 7 days of use. To clean your filter, simply rinse them under the tap. If they remain dirty or discoloured after rinsing, they must be replaced. If you do not change your filters, you risk damaging the pump, due to increased energy consumption and stress on the system as the water circulates. These hot tub filter cartridges are compatible with Bestway type I flow clear pumps. Keep your hot tub clean and your water pump working its best with these flow-clear hot tub spa filter cartridges. Bestway