Clarification of "tied up" vs "Free"?

Quote:

Originally Posted by cschnurr

I'm not sure if Dave was saying.....

Well, I blew that now didn’t I?:o

Let’s try this, I’ll recap and take one last stab:

Quote:

-Free Chlorine, stuff available to do its work

Correct

Quote:

-Combined Chlorine, stuff that's attached to the dead stuff.

I think you should think of CC as used up chlorine or better yet, chlorine waste.

The chlorine that is "attached to the CYA” is measured as FC and TC. FC plus CC equals TC always. Just remember that it is less effective than it would be in it were not attached to the CYA.

Dave