CC lower than FC.

WillMech

New member
Aug 7, 2020
1
Kilgore, Tx
Using the taylor 2006 (FAS-DPD) test, I am getting a high FC, but Combined isnt even close to results. Am i doing something wrong testing? 6ppm free and 2 Combined. Let test sit after testing Combined and after a min it will go back pink. Has anyone had this and is this normal?
 

CrystalRiver

Well-known member
Jun 19, 2020
339
Massachusetts
I think you may be confusing combined chloride with total chlorine. Total chlorine is free + combined. Combined means that the chlorine is bound to something (often nitrogen) but hasn't yet left your pool. Combined chlorine is what gives pools that classic "chlorine smell." It will offgas with time and UV.

We don't use total chlorine on this forum. Free and combined (bound).