Been successfully using the BBB method with my new pool build this year up until now.
FC = 4 - 9 - usually 3-4 at end of day, and bring it to 9 at night currently
TC = 4 - 9
CC = 0.0
PH = 7.6
TA = 120
CH = 90
CYA = 50
Temp 90 - 92
Over the last few weeks I was keeping the FC at 6 or 7 with a daily loss to about 2 or 3 until our temps here in south Louisiana began rising above 90 and the pool water temps went up about two weeks ago after a week long period of 1/2 rains daily that finally stopped. Started seeing what looks like greenish algae blotches beginning to form along the coves and near where a few wrinkles are in the liner. So I shocked for two days, (calculator shock level 16 - 17), after vacumming to waste all the green splotches, keeping the level up then let it come down to 9 and kept it there with a daily loss of about 4 maybe 5.
I have about 10 - 11 hours direct sun and heat indexes in the upper 100s. The pool does not really cool off at night when the temp stays in the lower 80s and heat index remains about 90 at night.
I have been targeting to 9, but after two days the botches returned. So I brought it up to 9 last night again before dark, scrubbing the blotches clean before adding the bleach. Did the overnight test, testing it this morning before the sun hit it, and I got 8.5 showing only a 0.5 overnight loss. I know you normally overnight test during shocking, but I wanted to see how much I lost during a normal run. I cannot figure out why these botches keep returning after a day or so. I am using the FASDPD test for accuracy.
This has been repeated over the last two weeks twice.
The local pool experts are advising that everyone around the area has been having problems with algae reforming even two or three days after shocking even with high levels of bleach due to our past heavy rains and extreme heat. I have inspected the blotches during vacumming under the water up close with scuba mask and it appears to be the regular old green algae that "poofs" when you disturb it. It does not look like mustard with the pictures I have seen with the greenish/yellowish/brownish tint. The water is relatively clear for the most part with some slight haze to it. I have bleach scrubbed all floats, washed bathing suits, and scrubbed the ladder/walls. I had my pump to run on 12 hours from 9:00 am to 9:00 pm and just started running it 24 hours straight, but it reappears. My one jet is pointed outwards away from the return and can see with floating objects that circulation appears to be correct, causing most debris to settle directly in the middle of the pool.
Are my numbers correct in anyones opinion, am I doing something wrong or is it just the extreme weather, is anyone else having a similar problem?