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Thanks for the great answers everyone, I had a feeling it was a measurement error but I didn't understand why. My OCLT resulted in 1.5 FC loss over 8 hours. 7.5 to 6.0 FC. Not quite good enough... Should I dump in another 8 gal of chlorine(10%) to get back up to full shock level? Also, my CC...

To dilute it so I didn't have to use an insane amount of reagent. I also tested the bottled water after to ensure it tested at 0.0 FC

Bottom line: Added 8 gal 10% hypo to <1 FC pool, now testing shows I have 61 FC? Pool calculator said 8 gal would add 30 FC. Tested after 24 hours running the pump. I added my pool water to the 10mL line, added bottled water to the 44 mL line for dilution, 2 powder scoops, and it took 28...