Clarification of "tied up" vs "Free"?

[cschnurr]

You are right, the term does seem to imply "Combined" however his statement read "However, there is also chlorine "tied up" in the CYA" so, trying to keep the comparison of apples to apples per se, I followed suit. Sorry for the confusion. I would always refer to CC as Combined since technically it is not "tied" up but "used" up.

Dave

This thread has gotten a bit over my head and I'm having a hard time deciphering the chemistry.

I'm not sure if Dave was saying that Donna's PoolBoy was correct in saying "I thought "tied up" chlorine was the same as "combined chlorine."

or if I was correct to say there not the same.

In my KISS (Keep It Simple Stupid) level of chemistry, I'm confused about the following types of chlorine.
-Free Chlorine, stuff available to do its work
-Combined Chlorine, stuff that's attached to the dead stuff.
-I'm not sure about chlorine attached to the CYA which for lack of a different name I called "tied up" chlorine. My understanding is that this is buffer being stored for future work.

Since adding CYA, will increase the tied up chlorine, but doesn't seem affect CC, I figure that tied chlorine cannot be part of CC.

So I have 3 questions.
1. Is chlorine tied up in CYA a part of CC or not.
2. If they ar different, is there an actual name for the "tied up" chlorine?
3. If they are different, than the tied up chlorine must be measured in both TC and FC, or neither so as not to affect on CC. [TC-FC=CC]
Which is the case?