Okay, I'm still new to all this testing but I'm wondering how to check the chlorine levels in my water with the Leslie's basic OTO test kit. When I put the 5 drops in, cap it, and then shake it, my chlorine reads .5 ppm and then like 20 seconds later it reads around the 1-2 ppm color. Which reading is correct, the immediate one after shaking or a few seconds later? I know how to check it with the FAS -DPD test kit, but want to use the basic kit for quick checks. Thanks so much.