Update: The shock may have been because of a combination of factors - a new salt and the increased ph. I have not observed any negative impact from the use of the salt, neither have I noticed any special positive impact. I will add their 3-ions product and will be measuring Calcium and Magnesium before adding and (hopefully) each day after.
Did not notice any effects after my 10% WC. There were no negative effects, but with this small sample of WC, I wouldn't be able to provide any real thoughts to it.