... 1,self-owned Chinese invention patent 2,no need to change the screen 3,easy to operate and simple maintain Specification1, ... cm2, initiative intherationally (interational patent)2, No need to change the screen, but backflsh of rapid pulse by little clean material ... 95%4,No interrupt the product5, The filtering screen can be used more than 100 times.(depending on the density of the screen)PS:It ...