In dealing with my ongoing trials in testing pH and Cl with 'color vials' provided in TF kit, I came across something I don't understand. I have a test kit similar to the TF for testing pH and Cl that came with our pool. It all looks the same, however in the 'pool' kit, before you add the reagent to change the color to indicate the pH level, you first add another reagent that says it's designed to 'remove' Cl first before testing. Yet the TF kit skips that step. Is the removal or not of the Cl important in testing pH?