So here is what works for me I’ve had this happen several times through the last 3 or 4 years if you make sure your pump is off and there’s no pressure on the system before you turn on the city water usually works fine if for some reason you forget to do that which I do quite often you want to make sure the city water is off turn the pump on for a few seconds open up a Fossett let it run a few seconds shut it off shut the pump off and then open the Fossett for a few seconds to get rid of the pressure in the system and then turn your city water back on that usually fixes the problem
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