The 16.5” x 18” Center Port DE Filter Grid is designed to work seamlessly with Sta-Rite System 3 Models S7D75 and S8D110 and Swimquip Center Port pool and spa Diatomaceous Earth (DE) filters. This high-performance grid offers 36 square feet of superior filtration, capturing particles as small as 2-5 microns to ensure clear and clean pool water. It is made from durable, high-quality materials to withstand regular pool maintenance and provide lasting performance, helping your filtration system run efficiently by allowing water to flow with minimal strain on the pump.