You MAY want to add some acid to bring the pH down, but the the Acid Demand test can be difficult to interpret. I would START by adding 1/2 CUP of acid, not a quart, and see after a couple of hours where you pH lands. Remember, with everything but Chlorine, it's always better to add less and then more as you need it, rather than overshooting your goal and having to add something else.