water treatment machine The principle of 2-step hyperfiltration device is to adjust the PH-value of water through fiwater filterrst grade device, then let second step high pressure pump transfer liquid into the second step hyperfiltration system to treat and get the cleaned water at last. The desalt ratio of the 1-step hyperfiltration system is over 99.5%. It neednt flow through the way of direct exchange treatment and it can be up to the standards of bottled drinking water(conform to GB17323-1998).