Actually Captain John has every right to be concerned.

My Liberty pump cycles between about 30 and 42 PSI, the back-up Shurflow (otherwise known as a wimpy pump) cycles between about the same pressures, it just does not have the flow rate, and like most coaches the municipal water pressure is regulated to about 40 PSI, although I can remove the regulator. I think all of our coaches as equipped have pressures which average below the specified range.

I have been flushing the system and actually it produces RO water in more than adequate quantities for my intended purpose using just the bus water system and not my house supply. The lower pressure only seems to impact the rate of production which at specified pressures of 40 to 100 PSI is almost 15 gallons per day, a quantity I cannot imagine us ever using.