CLEAR2O DirtGUARD Replacement Sediment PreFilter will be the first line of defense capturing and removing particulate matter like dirt, silt, sand and debris from your water. DirtGUARD Solves RVers’ Most Common Filtration Issue – Sediment! 20 Micron Polyethylene filter provides a higher dirt holding capacity. Eliminates silt, sand, sediment, rust & other particulates. Compact and durable design. Prefilter enhances the effectiveness of inline RV Filter. Fits most Inline water filter brands. Backwash extends filter life between changes. Washable and Reusable. Easy to install and replace filter. Recommend to replace filter every 6 months or as needed. Only fits model CPF1000. Note: Always connect to a known water source and use a water pressure regulator. Water quality varies depending location and filter life varies.