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A previous pool person closed our pool last year using two of these check valves to plug our lower return lines. The up-side is they are easy to blow the lines - just attach it and pump air through it. It shuts off the back-flow by itself. I'm a little leery of using them without knowing for...

New to the TFP and this forum, so "HI" first of all. I've been enjoying reading and learning what's here - excellent stuff! My conundrum is this: I've recently purchased the TF100 test kit, and my wife and I have been carefully testing our pool water to get it back in balance after a lengthy...