Scope of delivery - MSPA compatible swimming pool filter, replaceable hot tub filter FD2089Operation - Foldable design, increases the filter area, thickens the filter membrane and has a strong ability to absorb dirt.What You Get--Filter impurities to reduce residual chlorine and provide you with clean, fresh water.Dimensions: Outer Diameter: 110mm; overall height: 86mm. When to replace - It is recommended to replace the filter element every 3-6 months for the best experience. The hot tub filter helps remove dirt and bacteria, providing you with clean and fresh water. Filter Element Size: Outer Diameter: 115mm; total height: 86 mm. The model is FD2089, filter area (square feet): 0.4; cover material: ABS. MSPA spa filter: upper end: ring, lower end: flat 6 small steam holes. Filter cartridge compatible with the MSPA model: suitable for Uscany, Elegance, Camaro, Alpine, Blue Sea and Silver Cloud.