Outer Diameter: 10 1/16" Length: 8 9/16" Media: 50 SF with Pleatco PAP50-4 Unicel C-9405 Filbur FC-0684 Pentair R173213 59054000 Hot Tub Spa Filter. SpiroPure pool and spa filter cartridges offer long-lasting, durable filter media with high dirt holding capacity clear, sparkling water in your pool or hot tub spa. A strong inner core means increased strength without hindering water flow or filtration permance. Easy to install, durable filter cartridges that allow high filtration permance and efficiency
