I can't seem to find how to test chlorine when up to shock level (16+). I have the TFT test kit, isn't there a way to test and not use so much R-0871. I see some mention of it around but can't find the exact procedure anywhere.
Here's a couple alternatives:
5ml sample, multiply drop count by 1 (used to save on reagent; not as precise)
10ml sample, multiply drop count by .5 (standard method) - most common
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