I moved your information to your signature. Thank you.
With a SWCG, you should not use dry acid. Your SWCG manufacturer spells that out in the owners manual.
You should use muriatic acid. Store the jug separately, in a plastic container like a 5 gallon bucket, with lid. Store it outside, not near any metals.
Add the muriatic acid into the return stream of the pool, pump running. If you wish, you can brush the area after you add it.
The pool is safe to enter within 15 minutes after adding the acid.