Except for chlorine doses, we generally recommend trying to gradually dose up to a target level, instead of trying to do massive all-at-once doses. Gradual doses avoid a LOT of problems.

But . . . remember the exception: too much is usually just right, with chlorine, especially when you have pool problems. (But there's an exception to this : if you are dealing with metal stains, do NOT overdose with chlorine, and do use an algaecide.)