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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...

Excellent. I'll trust the tests. I started SLAMing Friday after these tests were done and ran an overnight chlorine loss test each night/morning. This morning it's still holding pretty high, though it did drop some. I'll stay on the SLAMing cycle until we get it all. Thanks for the quick...

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...