This is because the main function of the RO membrane is to remove salt from the water. As salt accumulates on the surface of the membrane, it is necessary to use part of the water that has been filtered by 5 micron PP cartridge, 1 micron PP cartridge (granular activated carbon) and compressed activated carbon to flush and take away the salt from the surface of the membrane. More, only the salt content than the original water grew by 20%, so the drainage can be recycled.
In summary, pure water equipment excluded wastewater can be recycled, and in the case of non-professionals do not necessarily notice, you can take a bottle of raw water and drainage each in the sun for an hour to see the precipitation of water quality will be known.
