Okay, my bad...it's been a few years since I used the hth OTO test, and at that time it only measured for TC. There was no distinguishable difference between FC and TC. So, in theory, yes you could read your results, multiply by two, then re-read and multiply and use the TC = FC + CC. However, you need to understand that the OTO test is really giving you a ballpark, and you lose a little of what accuracy you had by diluting--so I would not rely on that test kit to give you good CC numbers.

Janet