This is the first year I will be closing the pool (moved in November). Last year the previous owners closed in August. Upon opening, I had to use 40-50 jugs of bleach to get the pool to hold FC. I was told on TFP that this may be ammonia that was converted from the CYA, which I suspect is the case. Is there was way for me to prevent this from happening this year? I will be closing much later, when water temps are below 60, SLAM and add Polyquat as outlined in the 'closing a pool' thread. I also plan to open when water temps are around 60. Will this be enough, or is there some other precaution I need to take?