This isn't a backflow issue, but is city water filling the fresh tank through the pump, and is not a health or safety issue. We had a failed check valve in our pump a couple years ago, which was filling the fresh tank. Not being where I could purchase a new pump, I went to the local hardware store and purchased a check valve along with a couple sharkbite adapters. I cut into the PEX line ahead of the pump and installed the check valve, which solved the problem. I later replaced the pump due to other issues. In the photo, the check valve is just left of center in the lower part of the picture.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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