The Reverse Osmosis Pumps job is to raise the water pressure entering the RO unit. The process of reverse osmosis pump is driven by pressure. Although some membrane manufacturers claim that small household RO systems may function at low pressures as low as 35 psi, the truth is that if the pressure is below 45 psi, you won’t get much water and the quality of the produced water will suffer. Low intake pressure causes the unit to generate more rejected water, less drinking water, slower filling of the storage tank, and worse quality water.
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