I read somewhere (I think here) that with the FAS-DPD chlorine test you should always add one more drop of the chlorine test reagent (#0871 in the Taylor kits and I think in Ben's as well) after the sample turns clear before performing the combined chlorine test. If I remember right, it said that if you didn't do this you would you would always show a CC level of 0.5 (or 0.2 if using the 25 CC water sample).

Wish I could find that post...