I did the overnight chlorine drop test and seems my FC is not dropping. However, I am seeing visible algae! It is in my leaf catcher, on the cleaner hose, and I am seeing some on the side of pool - but water is really clear. Husband has been using the little Taylor kit with the chemical measurements on each side and the chlorine reading doesn't go high enough. Last night I did the drop test and was able to discern that I am no where near high enough on chlorine. I will attempt the SLAM - but wondering why FC didn't drop if there is obvious algae?
My readings are :
CYA 65 (I think. did 2 tests and ran out of chemicals, one showed 65, one looked closer to 80)
Pool is 14 years old, plaster is not great - being replastered this fall.