Longer lasting clean: This spa filter makes it easier to keep the water clean than common filter paper. Enjoy clean bathing and fun with your family and friends. However, if they remain dirty or discoloured after rinsing, they must be replaced. Otherwise, the filter pump may get damaged. Compatible model: The replacement cartridge filters are compatible with all RELXTIME spa pools. Outer diameter 100mm (9.9cm), inner diameter 60mm (6.1cm), height 79mm (7.9cm). The grey mesh cover protects the filter. Maintain and reuse: It is recommended to change the spa filter regularly to maintain filtration efficiency and replace it every 2-3 days during heavy usage. To ensure a constant replacement pool filter performance, clean your spa filter cartridge replacement before and after use. The filter can be used repeatedly after proper cleaning and maintenance. High filtration performance: The replacement cartridge filters feature extra-durable plastic and quality Dacron fibre pleats, even the finest dirt particles can collect, such as hair, leaves, dust, sediment, and sand, and ensure clear and clean water. Easy to clean and replace: This hot tub filter cartridge can be cleaned very easily, simply remove the filter from the water inlet inside the hot tub, remove the cartridge, rinse with the garden hose and replace it again.