What's it - - MSPA compatible swimming pool spa filter, replaceable spa filter element for FD2089. How it works - -Foldable design increases the filter area, thickens the filter membrane and has a strong ability to absorb contaminants. What you get - - Filter out impurities and provide clean and fresh water. What's the size - - Outer diameter: 110 mm/ 4.33 inch; Total Height: 82 mm/ 3.23 inches. When to Replace - - It is recommended to replace the filter element every 3 to 6 months for the best experience. The filter spa helps remove dirt and contaminants and provide clean, fresh water. Model for FD2089, Filter Area (Square Feet): 0.4㎡Top 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-layer design: The pleated 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: 8pcs x