Been using the BBB method for over 3 years and it has been a godsend. During all this time, I have never had an issue
with any type of green anything in the pool. However, something interesting is going on. I live in MD and of course
this weekend we got a ton of rain. The wife took me for an over night to Philly on Sat. So knowing, I wouldn't be around
to monitor the pool for a day, I boosted my FC to 11. (CYA is currently at 50ish). Sat had all day rain. I came back on
Sunday and peeked in the pool and saw a lil green at the transition from floor to wall. So as warm as it was yesterday (insert sarcasm), I got in the pool and brushed and there was more green on the transitions from floor to wall all around. So I brushed to dislodge it all and turn the pump onto high. Now the pool appears more milky (which should be a sign that
the algae is dead) but I don't seem to have lost any chlorine. I ran my numbers before I slammed and here is where I
was at: FC=9 CC=0 PH=7.3 CYA=50/55ish TA=100. I calculated for the pool (15600 gallons) to boost the FC from
9 to 20. It wound up being an FC of 24. At 6:44pm yesterday my FC = 24 and CC = 0.25. At 9:33pm, my FC = 24 and CC 0.25. This morning at 6:30am my FC = 23.5 and CC = 0.25.
I would have expected to have an FC that was much lower. Is it possible to catch the start of an algae bloom at the right time and kill it before it really gets started and don't lose much FC? Really confused on this one. I really expected to have to keep boosting the FC level to around 20 for an extended period of time.