Been reading on here for 7 months, and we started our new (and first) pool with TFP 3 months ago. Fortunately, we have had no chemistry problems, and we have not been pool-stored. Rather, we have had the clearest pool water I have ever seen. But I test (esp FC) almost daily. Lately, I have noticed that I can kind of discern FC just by looking at the water. Is that the normal case? Or am I imagining it? Because eyeballing is much more convenient. And I think if eyeballing your FC is possible, it would be a strong testament for the TFP method.