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How do we read/treat these numbers??! May I jump in here for some related advice? I am a TOTAL newbie (both to caring for a pool and in regard to this website), and our 20 year-old in-ground pool just tested out as follows: TH -- 100 FC -- 0 (yes... zero...) Br -- 0 pH -- 7.3 TA -- 80 CYA --...