I found this in my SWG owner's manual (A hayward salt cell as part of the AquaPlus automation system):
NOTE: The use of dry acid (sodium bisulfate) to adjust pool pH is discouraged especially in arid regions where
pool water is subject to excessive evaporation and is not commonly diluted with fresh water. Dry acid can cause a
buildup of by-products that can damage your chlorinator cel
So what would you use them, to lower it? Of course what I have downstairs for lower is bisulfate, and carbonate for plus. I used some at the end of last year (the lower) so hopefully one time is ok, especially since I don't like in an "arid" area.