This Taylor kit has a 'total' chlorine/bromine cell, a pH cell and a bottle of OTO solution and R-0600 Phenol Red solution. We use a floating chlorine cartridge so I do not worry about the bromine. I also have the instruction sheet (only) for our old Poolmaster Pool & Spa 3-way test kit which says:"..."'Free Chlorine Residual' is tested by adding 5 drops R-0600, cap vial, invert several times to mix, read result within 2-3 seconds. 'Combined Chlorine' is tested the same way except result must be read in 1-2 minutes..." Are these 2 completely different tests with different color standards on each kit? If so, which is the best test kit to use? Thank you.