My house pressure is 25-30psi and this thing keeps the diaphragm at 95-100psi throughout the cycle and automatically flushes smoothly to keep the tank from clogging. My DI bed at 6 months is in MUCH better shape at 6 months than without this unit and my reverse osmosis membrane looks almost new and has barely crept 2ppm. Added to this is the complete absence of sewage. Thing works so well I'm ALMOST 1:1. The waste is a bit higher because when you reach 4 liters of water you have 4.5-4.6 liters of waste water. Without the pump I had a loss ratio of 5:1. Ouch.
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