Thank you for your help, BigDave! I had hoped I would hear again from Chem_Geek as I ASSUMED that he didn't notice (in my long diatribe) that my pool store said I don't have an ammonia issue or that I never added stabilizer this year so I couldn't be converting CYA to ammonia. Maybe he was saying I DO have ammonia but that the heavy chlorine doses are knocking it out by the time it's tested? I am SO confused!!!! I will go get my own ammonia kit from a pet store but so far I can't seem to find an OTO kit. If I don't find one tomorrow, I will get one on-line and if so, results may take awhile.