Maybe. Adding pH Minus (acid) would have REDUCED the likelihood of calcium carbonate precipitation. Regardless, do NOT drain a vinyl INGROUND pool. Period.
If the white c loud occurred almost instantly, it could be calcium + baking soda. If it occurred as much as 2 hours later, that's much less likely.
But, without more info, it's hard to tell:
1. What are your pool numbers? (Get a K2006 => http://pool9.net/test/ -- 'guess-strips' don't count!)
2. How are you treating your pool? (list everything (maker / name) that's gone into your pool in the last 2 weeks.)
3. Have you done the DE test on your filter, to verify that it's working properly? (http://pool9.net/de-test/
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