The prefilter can block large particle impurities with a filtering accuracy of about 40 microns. Before it is used in RO water purifier and ultrafiltration machine, it can effectively extend the service life of household appliances, which is about a few hundred yuan. Nobbana P1 prefilter adopts high-density pressure gauge, which makes real-time monitoring more reassuring. It can effectively filter impurities and is not easy to block by surrounding rapid suction and backwashing.