I don't think you understand the difference between FC, CC, and TC. Read this: ABCs of Water Chemistry
Also, what test kit are you using? Do you have the FAS-DPD chlorine test or just the yellow OTO color matching test?
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The multiplier depends on how much water you used for the sample. 25ml = 10ppm per drop ; or the now recommended 10ml = 25ppm per drop
Also, what test kit are you using? Do you have the FAS-DPD chlorine test or just the yellow OTO color matching test?
- - - Updated - - -
The multiplier depends on how much water you used for the sample. 25ml = 10ppm per drop ; or the now recommended 10ml = 25ppm per drop