First Defense of Whole House Whole House Pre-Filter, with a 40-micron pore size stainless steel filter, is designed to prevent particles such as sand, rust, limestone and sand from entering your home. Prolongs Water Facilities' LifespanProtect your household plumbing, kitchen and bathroom equipment from particulate impurities in municipal water, which can block water taps, shower nozzles, water heaters, washing machines, RO water purifiers and other water-related equipment. Full-Automatic Rotate & Flush Backwashing prefilter can work without manual washing. It has an innovative automatic flushing function, which can save you time, while ensuring that your water filter is automatically flushed regularly. Default automatic Flush every 15 days , Moreover, driven by water pressure, the filter can rotate automatically, This will eventually prevent the filter from clogging. If necessary, you can also press the "Flush" button to flush the system immediately. Monitor Water PressureBuilt-in water pressure gauge, monitoring real-time water pressure at any time, family members can take measures to deal with abnormal water pressure. To ensure the safety of water, general household water pressure range : 0.1MPA-0.7MPA . Featured Material The 40-micron filter mesh is made of 316L SUS stainless steel, and the head of the main body is made of lead-free brass, and the service life is more than several years. The heavy-duty food-grade transparent housing does not contain BPA and has passed the water hammer test of 150,000 cycles and the highest pressure test of 1000 psi.