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12000 Gal in ground pebble tech pool. FC 24 PPM TC 24 PPM CH 250 TA 170 CYA 80 PH 7.5 Salt 3000 PPM - By titration using strips it shows 3.8 which seems to indicate less than 1000 PPM. My SWG indicates 3900, and test from pool store last week showed 3000 also, so I tend to trust the titration...