Help me....LOL. I am a frequent flyer at Leslies Pool to buy Algae cleaner. I have had this infestation of black algae since May. A combination of problems got us there, our salt cell died and it took the builder 3 weeks to get the problem fixed, it was so hot this summer and the pool is in direct sunlight, we had A LOT of rain for our area, and Leslies was out of salt for weeks at the beginning of the summer. All of that said though....I have been trying to get rid of it this entire time and I cannot get it gone. I have cleaned the filters twice since May, they weren't even that dirty last time. My PH is 7.6-7.8, my CYA level is 80, my salt level and chlorine level are normal(I can't remember the exact numbers). Everyone is stumped. I have used black algae cleaner, and copper algecide multiple times. I shock, wait 6 hours, then put in the algecide, and repeat the process the next day. While most of the spots fade, they don't go away and they just come right back.
I have a 36,000 gal Pebbletec pool.