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Been maintaining my own spreadsheet over the years but now that I have a newly installed granite pool I'm also going to start watching CSI metrics more than I have in the past when I had vinyl pools. I track the following values each week throughout the season... 2018 Season Date FC...

johntest

So the question I have is this is a brand new pool setup and the plumbers who came out to hook up my equipment placed a check valve in this location as shown in the picture. The plumber told me that they need to do this because heat pumps would have too much pressure going to them if the PVC...