This Pre-Filter Is 90% Efficient And Easy To Use. It Meets Fda And Nsf Standards.Features: Attach To Any Standard Garden Hose Extends Your Pool / Spa Filter Life Removes Solids, Dirt, Sediment, Rust, Calcium, Iron And Copper From WaterDimensions: Od: 2-3/4" Length: 10" Top: Hose Fitting Bottom: ClosedRecommended To Use With Dyno-3-Zone Cd Ozone Generator Ai # 6-05-0038 / Mfg # 76508 Specifications Category: Ozonators / Sanitizers Subcategory: Ozone Parts / Accessories PP6903