Right now I have FC of 0.5 and TC of 1-2, giving me a CC of more than 0.5, so it looks like shocking is in order. According to the best guess CYA, my shocking level is 15, which calculates to 2 1/2 large bottles of Bleach.

My question is, do I just bring the FC up to 15 ppm and let it return to normal, or do I keep adding until I can to maintain 15 ppm overnight?