The industry standard for backwashing is when the filter gauge shows a pressure that is ten pounds higher than a ‘clean’ pressure. All filters work by forcing water through a porous media which traps the larger particles from the water. When the filter media is clean, the water passes easily through and the gauge pressure is lower. As debris is caught in the media it is harder to push the water through the filter which makes the gauge pressure higher. When enough debris is in the filter to clog it up by ten pounds, it’s time to backwash. Call us for complete backwash instructions for your filter or we’ll be glad to schedule a visit to insure your equipment is optimal.