Carl & Richard:

Why do you guys think I go to a pool store? I don't have a pool store in my town, and nobody has sold me on anything. Not sure what I said to get that type of response (?) but it's just me, myself and I here in SW Michigan. As my original post states, I use the Taylor K2006 for my testing. I also posted my CYA was between 40 and 50, but it's not above 50. Seeing the "black dot" disappear is certainly subjective, but my eyes aren't THAT bad. Not sure what any of that has to do with my original post, but wanted to respond. Thanks for the help.