SPECIFICATION: Length: 13", Outside Diameter: 8", Top 2-1/16" open, Bottom 2" male slip fitting, Filtration Area: 75 sq. ft. SPA FILTER CARTRIDGE REPLACEMENT: Unicel C-8475 C-8475RA PCS75N PCS75N-M Filbur FC-3320 FC-3320M Maax Spas 100594 Coleman 75 Pure N Clean PC-3320 Aladdin 17513 Hot Tub Spa Filter. HIGH QUALITY FILTER CARTRIDGE:Durable and Washable Pleated fabric that maintains strength even when loaded with sediment,our high flow core is not only providing industry leading flow rates,but also causing less wear and tear on your pump. PLEATED FILTER DESIGN:The Trilobal Fabric Structure Pleated filter material maximize the contact between contaminants and filter media,allowing for greater capacity and contaminant reduction. EASY TO WASH:Just rinse with water,it is recommended that you clean filter cartridges every 2 weeks to maximize your spa's performance. SPECIFICATION: Length: 13", Outside Diameter: 8", Top 2-1/16" open, Bottom 2" male slip fitting, Filtration Area: 75 sq. ft. SPA FILTER CARTRIDGE REPLACEMENT: Unicel C-8475 C-8475RA PCS75N PCS75N-M Filbur FC-3320 FC-3320M Coleman 75 Pure N Clean PC-3320 Aladdin 17513 Hot Tub Spa Filter. HIGH QUALITY FILTER CARTRIDGE:Durable and Washable Pleated fabric that maintains strength even when loaded with sediment,our high flow core is not only providing industry leading flow rates,but also causing less wear and tear on your pump. PLEATED FILTER DESIGN:The Trilobal Fabric Structure Pleated filter material maximize the contact between contaminants and filter media,allowing for greater capacity and contaminant reduction. EASY TO WASH:Just rinse with water,it is recommended that you clean filter cartridges every 2 weeks to maximize your spa's performance.