I did the OCLT last night just to make sure there wasn't something in my pool that I can't see (the pool is only a few weeks old to me as I just bought this house). I had taken the chlorine up to shock levels for my CYA (CYA = 45-50), and when I measured it last night it was at 17 (down from 20 earlier in the day).
Specifically, I did the 10 mL test on my Taylor K2006 kit, and it took 33 or MAYBE 34 drops last night to come clear. I hand stir the test. This morning it took me 30 or MAYBE 31 drops to get totally clear. That's either a 1 or a 2 ppm drop, but it's a pretty high FC level so I didn't know if that affects it. Is the 1.0 ppm rule hard and fast?
Also, on the OCLT in general, it says sometime after sundown is when you should test. Does this mean pretty shortly after sundown or midnight? I did my test at like 9:00 last night, but I was just wondering. And are you supposed to leave the pump running or does it really matter?