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FC, CC, pH daily. TA, borates weekly (vinyl pool) CYA monthly or before a SLAM.

What kit are you using for testing? Please post results in the format FC CC pH TA CH CYA Your problem is likely caused by a TA that is not balanced. TA and pH go hand in hand. Please read the following articles https://www.troublefreepool.com/blog/table-of-contents/ To see how we do things...

I get all my stuff from Amazon. Next year though I'm getting a TF-100.

I run mine for 4 hours continuously. It's only a week old, but water is blue and crystal clear.