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IMO, I would not use soda ash. With such a high calcium reading already the elevated pH of soda ash -vs- baking soda will simply exacerbate the inevitable precipitation as calcium and alkalinity 'right' themselves.
Good old baking soda should work fine. Again, with calcium being that high you will likely see some precip anyways until alk / calcium right themselves.
I'm more concerned about the 570 calcium reading. If you're test kit is correct you either have a broken batch of salt or are dosing calcium.
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