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It took 140 drops and constant swirling to turn the cylinder blue. This is my first test with the TF-100. Readings: PH 7.2 FC 5 CC 0 TA 60 CH 1400 CYA 45 I have a 25 year old plaster pool, 20,000 gallons, SWG and sand filter w 3/4 Jandy Stealth. I just re-started a negative edge waterfall...