Inlet pressure above 100psi, I shut off the power as soon as I saw it reach 100psi per square inch , 80psi is the maximum pressure for many reverse osmosis systems, exceeding the maximum inlet pressure will damage the reverse osmosis membrane and void your warranty. If you install a pressure switch before the inlet, the pump will cycle on and off and the switch will burn out. The best solution I found was to use a 4 gallon storage tank that my Ro system ran between the pump and inlet (slows down pump cycle time) and I bought a larger tank to use for water storage.
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