PUREPLUS 40 Micron Spin Down Sediment Filter - PUREPLUS Whole House Spin-Down Sediment Filter is designed to trap impurities before water entering to a finer whole house water filtration system. - This Whole House Spin Down Filter effectively protects terminal equipment and appliances such as downstream pipelines, water purifiers, water heaters, wall-hung boilers, washing machines and shower heads. - BPA-FREE material. The 40-micron precision mesh membrane is made of food-grade 304 Stainless steel. - Compared with the common filters, the backwash function can flush the water flow from the inside of the filter to the outside to deeply clean the impurities on the surface of the filter. Regular cleaning can be done easily without frequent disassembly of the water pipe connections and filter housing. - Turn on the drain valve and rotate the scrubbing knob, and impurities will be flushed away from the drain port. Regular cleaning can be done easily without frequent disassembly of the water pipe connections and filter housing.