Anyone ever notice different results when retesting the same water sample for FC/CC? This morning I took 4 different tests off the same sample to make sure I passed the OCLT and while the 1st and 4th tests varied by 0.5, which is fine, however the middle two varied by more than 1.0 (I did the 4th one extremely carefully to make sure I would trust the results). Also, when testing for CC and adding the 5 drops of R-0003, is it supposed to be an obvious change even if your CC level is 0.5 or less? It's hard to tell if I'm seeing a small change or my eyes are playing tricks on me at 5am (haha). I think the TF-100 is a great test and would suggest it to everybody as it is helping me finally rid my pool of algae. Thanks