I will be switching my chlorine Stenner setup to muriatic acid (installing SWG). I understand diluting the acid is recommended. I'm planning on using a 4:1 dilution.
When adding water and acid to the storage container while there is still some diluted acid in it, is it better to:
1-add water first (but isn't adding water to acid not good) then the acid?
2-add the acid first, then the water (again, adding water to acid- no bueno)?
3-dilute the acid in a different container, then try to pour that into the first container (can't see how to do that without getting acid all over my pool equipment)?
I'm guessing the first option would be OK if the diluted acid is weak enough, but want to make sure before I make a bad mistake.