My situation is pretty much the way the title sounds. Last week, after a winter of only occasional attention, I noticed my pool had some slight green along the walls and floor. I ran the numbers, and they came out looking like this...
FC - 0
CC - 0
pH - 7.8
TA - 70
CYA - 30
I poured 121 oz Clorox 8.25% in the pool, and brushed the sides and bottom. I also vacuumed. Each of the next 3 days I added one bottle of Clorox. The FC would come in around 10 to 12, CC at 0.5. Within a day or so, the pool became clear, and the green disappeared. All good so far.
I ran the OCLT each of the last two evenings, and I am losing about 1.5 each time. Specifically, last night my reading was 10.0, CC 0.5. This morning I was at 8.5 and 0.5. This afternoon, I tested and got FC 6.0 and CC 0.5. The pool still looks clear with no green accumulation. I also backwashed the filter this morning.
Should the high chlorine drop in the OCLT concern me? Everything looks good, and the numbers are close, but not perfect. What do you think?