This is my first year with intex pool and i would like to use the bbb method and calculator. I have purchaced the 6 way test from Wal. I am not really in the market to spend more money on a nicer test. So this 6 way test only tests for total chlorine/ total bromine in one, so where or how do I enter that in calculator? I only see FC or is that the place? Thanks for any advice.