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Free Chlorine Reading on Test Strip in a Bromine Tub

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My test strips have tests for Free Chlorine, Total Chlorine/Total Bromine, Alk, pH, and calcium hardness.

I use bromine as my sanitizer in the hot tub.

Recently I refilled the hot tub and got a Total  Bromine level that was normal but the Free Chlorine reading was as low as the test strip goes. 

My question is: Should I even pay attention to the Free Chlorine reading? Is Free Chlorine testing relevant when the sanitizer is bromine?

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