About three days ago, I discovered my pool had turned minty green and there was some visible algae on my steps. I thought it was strange that I had algae, because the FC level never went below the minimum of 2 ppm for my CYA level of 30. I think the issue was that I left the pump off for two days due to some problems with an air leak, and we had a lot of rain during that time.
What I found really unusual though was that even with visible algae, my CC level has been at 0 or below .5 ppm the entire time, including when the algae bloom started. I also passed an OCLT the first night of my SLAM.
I have been SLAMing my pool for three days now with no real results. The color seems to have lightened somewhat, but there's no end in sight. I have been brushing once per day and have left the pump on 24/7. I was hoping to close my pool this weekend, but I'd like to get the algae clear first. However, falling leaves (and worse, hundreds of acorns) are starting to be a real pain in the butt.
So is there anything I'm missing? Is it unusual to have algae this long with no readable CC? Should I close the pool with some algae and deal with it in the Spring or be patient and keep SLAMing until that algae is completely clear?
Latest test results:
FC = 14
CC = 0
CYA = 30
PH = 7.5 (from before SLAM)
TA = 70