Algae is Back
Hi Guys. I'm the OP on this thread, and thought I'd provide an update and ask a new question.
The yellow algae is back. It's in the same spot... where the floor and wall meet on a shady side, with a little less circulation than other areas. Last summer, with CYA in the 80-100 range, I raised FC to 20 and kept it there for about 3 weeks. I then let it fall and was maintaining between 8-12 all through Fall and Winter. There were probably 2-3 times I let the FC get below 8, but not for very long. The water looked very good until I noticed the algae was back about a week ago.
I want to whip this thing for good before swimming season starts. I checked CYA twice with the K2006 kit and also had the pool store check. Somehow it is DOWN to 32. It was very high 9 months ago (80-100). I have not drained any water and I have a cartridge filter, so I don't normally lose water. And of course, no slime over the winter. Question is: How could my CYA drop so much?
In any case, despite the surprisingly lower CYA, I have once again taken the FC up to 20 and I've maintained it there for the last week. I'm consuming 2.7ppm per day, which seems a little high. If any other suggestions on how to rid my pool of this beast, please let me know. Here are all my current numbers:
FC=22.5
CC=0
pH=7.6
TA=80
CYA=32
CH=250
Borates=50
Thanks for all the information and advice.
Mike
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35X20 in-ground gunite, free-form, 18k gal, pebbletec plaster, Pentair cartridge filter, Pentair 1.0 HP WhisperFlo pump, Polaris 280, heater, waterfall, Taylor K2006 kit and K1106
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