Last week, I did the SLAM and all three tests passed (CC=0, OCLT and Clear Water). Water was perfect green algae gone. Well for at least 5 days. I let the FC level naturally drop to my CYA /FC maintenance level of between 6-11. I woke up today to more algae. Tested everything (using TF100) and the FC was at 8 and CC=0, PH was a little low at 7.2. Also, tested CYA and it was still at 80 (I know it is high). Can anyone help me understand what happened? Is my CYA test off? I tested it several times outside with my back to the sun (multiple times before SLAMMING) and then today. Still reads 80.
I am a new pool owner and converted to TFP method, but now I am nervous that I might not be doing something right. Any advice?