Calcium Hardness


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
So I guess I shouldn’t use my main kit anymore to test FC right?
Correct. The TC test you have is OK to use if you get a strange FC result from the FAS-DPD (like a 0 and you are sure there is chlorine in the water). It is just a check that, yup, there is chlorine in that water.