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Sorry, i am an idiot. I meant to say I have a float switch, not valve, in the cistern controls the well pump. My bad.

Sorry LL, I should have clarified what I meant, by my estimation there is a probably 20-30ft length of pipe from the house that probably goes up 3-5 ft to the high point in the line, and then a 125-150ft length of pipe from that high point to the pitless, which is probably 7-10 ft drop...

Morning Reach! The pipe is always open at the top of the cistern, and always above the water line, the float valve in the cistern shuts off the well pump before the water line would ever reach the opening of the line. So my thought is its not a lack of airflow allowed in that is preventing the...

Thanks LL! Appreciate you taking the time to help out! I only mentioned the elevation as to give readers the idea of how cold we were talking. As far as elevation difference, the well line feeds openly into my cistern, which has its own pump inside that pressurizes the house, so I do not have...

Thanks Reach! I appreciate all the insights, you clearly like problem solving as I do. I have my doubts as to if the copper line is sloped properly all the way, it looks like it should be until just before the house, if I were to guess, it looks something like this terrible drawing of mine...

Thanks Cary! Just wanted to make sure I understood you right there. You would recommend either pulling the whole drop pipe and pump and drilling the 1/4" hole or two in the check valve at the pump? Or the other option is installing a couple more drainback fittings next to the current one...

Yea the welder hooked up 170ish amps to the line and it defrosted in 30 mins. I also had the idea of some sort of pressurized blow out, not sure how I would automate it though. Hoping as Cary mentioned that if I can make the flow of the drain back high enough it will pull back through that...

Thanks Cary! Might you have a link to or any information about a larger drain back valve, or what type of valve the well tech might have put in and if I could just stack a few of those? I can't seem to find the service invoice at the moment. Thanks a bunch, all of your previous posts that I...

Morning all. First post here, long time reader. Thank you all for all the help and information you have already provided me. I live up in the mountains of CO at 11000 ft and unfortunately came back from a trip to find my cistern not filling. I have a submersible pump at 365' depth, filling a...