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So you think it disappeared between 50-40 and not 40-30?

Finding this to be the hardest part about testing chemicals with the tf100 kit. I have done the test over and over and am finding that what is considered obscured is pretty subjective. I took pics at 0, 45, 40, 35 and 30. Can someone tell me at which level the point is considered obscure for...

Newbie here. How is the recommended levels of free chlorine in a pool which from what I’ve read on guess strip bottles etc, 1-4 ppm possible when I’ve read that a typical day burns up around 4 ppm. Wouldn’t that risk you a time frame where your pool would be 0 chlorine or near that and...