I'm going to do an ascorbic acid treatment this weekend. My FC will be around 7 (CYA 50) by Friday (I would lower FC now, but I'm going out of town until friday). I know I want my FC to be close to 0 before adding the ascorbic acid. My question is should I wait until my FC is 0 to add the polyquat 60, or can I do that while FC is at 7, then wait for it to fall to 0? Thanks for your help.
Current test results: