Out for the evening and it rained. Tested FC and needed to add some. Did so. Now, it's 11 pm. I'll need to get water sample at 6 am....7 hours from now. Is that enough time to determine if I've lost less than 1 ppm?
Thanks...was going to wait 30 mins bc I read that somewhere on here, but I'll do the hour to be sure. Am I correct to assume if it rains overnight, this test is invalid?
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