-Filtering is a separation process using membrane separation technology, driven by the pressure difference across the membrane, with the filter membrane as the filtering medium. Under certain pressure, as the feed liquid flows over the membrane surface,The micropores on the filter membrane surface only allow water and small molecular substances to pass through, becoming the permeate. Meanwhile, substances in the original liquid with a volume larger than the micropore diameter of the membrane are retained on the feed side of the membrane, forming a concentrate. This achieves the purpose of purifying, separating, and concentrating the original liquid.