Just starting with the TFPC method for the first time, had to drain 50% and re-fill to get my CYA down. My chemistry was the following after the refill:
According to the calculator (8.25% bleach), I needed to add 1 gallon to push the FC up to 5ppm. I put a gallon in, ate dinner, etc. About an hour later I re-tested, FC was the same thing.
Am I not waiting long enough, or how long does it take before I will see results in my test?