In preparing for an AA treatment to remove metal staining, I lowered my pH from 7.6 to 7.2 with Muriatic Acid on Sunday evening. Tested again last night and pH was still at 7.2. As a note my CYA was between 20-30 and my FC was at 5. Following the test I added 48 oz of Polyquat 60 anticipating it would further reduce by FC by morning and I could start the AA treatment. This morning, my FC was at 4 (tested using my DPD drops and not my TF-100 Taylor chemicals) and my pH had jumped back up to 7.5. I can lower the pH again by adding more MA, but before doing that and proceeding with the AA treatment wanted to get input if there is something else going on I should be paying attention to before proceeding with adding the AA. How long should I wait between adding the MA and starting the AA treatment, the standard hour or two the MA normally takes to mix in and reduce my pH or should I wait longer?