You may get some scaling.
Please look at Ben's method for lowering Alk. I think keeping pH that high is a bad idea--it drastically lowers chlorine's effectiveness.
Basically, you lower pH to 7.2 or less, which pulls down the alk, then you AERATE to raise the pH. Repeat the process until Alk is where you want it. Then use Borax to raise the pH to the desired level.
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