I will be ordering the TF kit as you mentioned. I was about to head back to the store, to have them test the water and tell me what to add to bring down the chlorine, i turned the knob down. I will try by best to refrain from the store water testing. Also do you order your acid from a online store, I understand the bleach you use to poor in as needed for chlorine, I use the tablets with the dispenser. My kit i have been using is a 5 drop tester as you mentioned.