What it is - - Swimming pool spa filter compatible with MSPA, replaceable spa filter element for FD2089. How it works - -Folding design increases the filtration surface, thickens the filter membrane, and has a strong ability to absorb pollution. What you get - - Filter impurities, giving you clean and fresh water. What is the size - - Outer diameter: 110mm/ 4.33in; Overall height: 82mm/ 3.23in. When to replace - - It is recommended to replace the filter element every 3-6 months to get the best experience. The filter of the spa helps remove dirt and impurities, giving you clean and fresh water. Model for FD2089, Filtration area (square feet): 0.4; mouthpiece material: ABS. Filter cartridge compatible with suitable MSPA models: for Uscany, for Elegance, for Camaro, for Alpine, for Blue Sea and for Silver Cloud. Multi-ply design: The ply surface design makes the pressure drop of the high-flow filter element lower than other filter elements and has a longer service life. Package includes: 4pcs x Filter Cartridge Keep your pool water clean and fresh with the help of this high quality replacement pool filter cartridge. It keeps the spa clean. The filter cartridge is installed inside the filter pump and catches dust as it passes through the system. Prevent dust from entering the pump and the heater, and prolong the service life.