Just opened out new pool. 36K gallon gunite pool with attached raised spa. getting chemistry under control (thanks to this awesome site, and the fantastic kit TF100!) Quick silly beginner question. I know you never add chlorine and acid at same time due to noxious gas formation, but are there any other combo no-nos? Or is it a good rule to only ever adjust one thing per 6hr period or so? thanks for the help!