Well, you won't reach a T/A of 200 and CH of 500 before the water goes cloudy.

I don't know that it does any actual HARM to a vinyl pool...but who wants to swim in cloudy, milky water?


You SHOULD be able to clear it up by adding muriatic acid to lower pH to 7.0-7.2 then use the T/A lowering technique of aeration to lower the T/A.