I have revised the intial post on this thread, to reflect discussions I had with Chem_Geek regarding the SWCG process.

The main difference is that the pH does not rise. It stays steady. This is the anomaly I saw with members mentioning this with liner pools. However with plaster pools the continuous leaching of calcium hydroxide, will raise the pH and so muriatic acid is needed accordingly. My apologies for any confusion this might have caused.

Pat