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Thanks for the replies. I think the test kit is great, I just want to be sure that I am using it correctly.

Hello, I purchased a TF-100 test kit to test my hot tub's water. I have a few questions about the testing procedures. First, should I let the water cool before testing? Second, when doing the FAS/DPD chlorine test, the pink water turns clear, but after sitting for a couple of minutes, it...