Revolutionary design greatly reduces filter backwashing and maintenance by capturing particles before they reach the filter. Easily installed on any existing filtration system. Ideal as a pre-filter to extend the life of your existing filter. The pre-filter works on the basis of centrifugal water filtration. There are no moving parts to wear out and no filter media to clean. Reduces backwash frequency for sand filters and extends media life. 2” unions, 1” purge valve.