limbery wrote:
Thanks for the great responses (and nice diagram)....but still wondering of what would happen if pump was turned on when city water was present....I guess if there is a backflow valve, then the effect would be the same as when the pump is on but no taps are open, so in other words....nothing would happen as long as there is city water pressure...
In my case the pump will pressure up to a valve that is turned off and won't let water into the system...but only if the city water is hooked up and the valve is turned that way.