SpanishCastleAle
Well-Known Member
Recently was shopping for an RO unit and came across a model that had a 'non-electric permeate pump'. One of the alleged benefits is less waste water. For whatever reason, I expected the pump to be on the high side of the membrane (higher pressure means less waste water). But this one has the pump on the low side of the membrane. The pump has four ports; RO IN, RO OUT, Brine IN, and Brine OUT. Does it work because it relieves any pressure on the low side, therefore letting the membrane see the full water pressure delta across it at all times? Do typical 'no permeate pump' units get less and less efficient as the tank fills and builds pressure?
I'm just curious is all. I might swap it it for the less efficient non-pump unit because the permeate pump is obnoxiously loud. It also really 'shoots' the Brine Out water into the drain, enough that it actually sprays a few droplets up out of the drain on occasion. I installed the drain saddle as close to the p-trap as I could.
I'm just curious is all. I might swap it it for the less efficient non-pump unit because the permeate pump is obnoxiously loud. It also really 'shoots' the Brine Out water into the drain, enough that it actually sprays a few droplets up out of the drain on occasion. I installed the drain saddle as close to the p-trap as I could.