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Thank you, Scott

Hello, I have been second guessing my PH test lately, after 10-15 seconds my ph reads 7.4 but when i let it sit for a minute or so while i do another test it drifts up to 7.8-8.0. Could someone please confirm when to read the test or is something wrong? I am testing with a tf-100 kit. Thanks...

Hello, I am not sure if we have the same type craters, but i got several last summer after i installed my AG pool. My theory is this, i used fine mason sand over clay soil on the bottom of my pool. It was compacted and level and perfect the first couple months then i started seeing these craters...