Quote:
Originally Posted by hillegom
I could be wrong, but I think when you use salt that has hardened, some of the sodium bicarbonate turns into calcium carbonate, and that makes for the cloudy water, it will no longer dissolve. Check the KH of your new salt water.
Hopefully some of the keener chemists can elaborate
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I had no problem using the salt. Ca, and KH/Alk and PH were in there acceptable range. Fish, invert and coral all seem normal when I was using this salt.