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Last night I repaired a die electric union on my buffer tank. I isolated the tank, drained the water into clean tanks so I could reuse the treated water, which I did.
After pumping the water from the tanks back into the buffer tank now I have alot of air in the system and cannot seem to control the pressure on it. I woke up to 25 psi on the gauge and water leaking from the back flow preventer.
I turned the system off and drained waterfrom the 2nd floor zone to lower the pressure but I hear a lot of air in the water circulating in the pipes as well as the automatic vents venting.
My question is which part needs to be replaced, pressure reducing valve, back flow or expansion tank? And secondly, do I shut it down and purge & vent each zone to get rid of all the air? I was reluctant to do that trying to keep the treated water and not introduce all new water.