Specifications of S8M150 System 3 Pool Filter: Length: 29 1/8", outside diameter:12 7/8", filtration area: 100 sq.ft. Outer Filter:Length: 21 5/8", outside diameter: 20 1/20", filtration area: 350 sq.ft.; Filter Material: Trilobal Filtration Fabric. Replacement Part Numbers: Inner Filter: Replaces Sta-Rite 25021-0202S, Outer Filter: Replaces Sta Rite 25022-0203S. Key Features: High Filtration Efficiency The 360°C cylindrical structure and folding design provide a larger filtration area that captures more contaminants in less time, keeping the spa clean and ensuring safe and healthy water. The filter membrane is made of thickened non-woven fabric, with stronger dirt-absorbing capacity, more accurate filtration, and deeper water purification. It has good mechanical properties and sunlight performance and is not affected by strong acids and alkalis. The thickened advanced trilobal fabric helps to catch more contaminants, end caps are resistant to breakage, and the enhanced center core makes the entire filter cartridge have a longer service life. Filter the water in the pool to keep it attractive and fresh throughout the season. Note: The S8M150 System 3 Pool Filter must be replaced regularly to maintain the efficiency of the filter as a practical tool. Compare dimensions to your existing filters to double-check fit. NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. Vickmons is an independent brand.