I have the HTH 6 way test kit from Walmart...

I test Cl and pH every morning. Cl is sually at a good 2ppm, but if I'm going to have 2 or 3 toddlers swimming that day, I re test to make sure there's enough chlorine to kill any accidents they may have. On many such occasions my Cl level has dropped to almost zero after only 4 or 5 hours. I tried testing the CYA level to make sure my water was stable and not breaking down the chlorine too fast. The instructions say that the water should turn cloudy after mixing in the test chemical, but I'm not getting that result, it stays clear. What am I doing wrong?