The domestic RO system membrane is made of the semi-premeable membrane with the 0.1nm filtration precision  for separating and removing the dissolved solids, organics, bacteria etc.

 

There are many famous brands for option:such as the Filmtec,CSM, Vontron and FCS brand.At the same time,according the water output capacity,the different membrane is available as follows :50GPD, 70GPD, 75GPD, 80GPD, 100GPD.