Randy Holmes-Farley
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My Tank Thread
Well, I often use it for freshwater and do near-total water changes for QT/hospital tanks. I'm not sure what the minimum detection level of chlorine using the color wheel is but I wouldn't be confident it's below 0.05 mg/L. And I wouldn't bet my life that it's below 0.1 mg/L either.
OK, I get that. I'd want a much lower level there too.