Ok, guys.....PB's cleaner was last here on Thursday....saw him measure Chlorine and water did change color in tube.....no, my TFT has been ordered but not here yet, so I purchased a simple test kit at Academy (trying to put myself in the habit of checking daily), but my water in tube doesn't change after adding drops......checked chlorine feeder (will do away with as soon as I master the TFP method) and it has tablets in there...am I doing something wrong?