I don't believe that is accurate, at most it might be a 10% 15% reduction in efficiency. There is no 10% reference in that document. In any case, why not lower PH immediately? There are lots of reasons not to have your PH higher than 7.8.
The effect of rainwater on swimming pools
- Thread starter duraleigh
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See post #6 by chem geek in this post
Chlorine and pH relationships. Chem experts knowledge?
here is a snip,
To be specific, with no CYA in the water, going from a pH of 7.5 to 8.0 has the active chlorine level drop by 50%. With CYA in the water, it drops by only 15%.
Chlorine and pH relationships. Chem experts knowledge?
here is a snip,
To be specific, with no CYA in the water, going from a pH of 7.5 to 8.0 has the active chlorine level drop by 50%. With CYA in the water, it drops by only 15%.
well, according to that Australian reference chlorine efficiency at pH = 8 is 3%, now considering CYA allows chlorine level to drop by only 30% (compared to what it is at pH=7.5), it still will indicate that at pH=8, we have only 9% effective chlorine? Am I missing something? One of the earlier posts says pH reading will be erroneous for high FC. But both the pool store analysis (when FC was 5) and my analysis when FC was 9 gave the same high pH >8. What is the threshold value for FC for correct pH reading with a Taylor K2006 kit?