I don't know if the techniques are valid, I guess we will have to prove them on Myth Busters but I heard that there are two techniques to pouring acid. The first is to pour it in a slug, all at once in the same spot. This is supposed to reduce pH plus TA. The second technique is to broadcast. This technique is to basically throw the acid out into the pool, kind of like tossing a baseball, and this will lower just the pH and not so much the TA.