Quote Originally Posted by PoolDoc View Post

Baquacil Shok is very strong peroxide.
Stabilized with citric acid and with a low pH. The percarbonate will be at normal pool pH if the acid is added or quite alkaline if it is not. While I have no data as to which is more effective I suspect the pH plays and important role here and that NOT adding the acid until after the conversion is the more effective route since stabilized 27% peroxide does not appear to destroy biguanide to any great extent, nor does MPS, which is also acidic. I have also seen patent data that indicates that sodium persulfate, which is also normally acidic, does not degrade biguanide to any great extent but at high pH it does.