Here's numbers, How am I doin'?

[ScottS]

I'm confused by the Cl readings.

Is a negative CC possible??

[CarlD]

FC = 6
TC = 5.9
CC = -.1

Sorry, these numbers are impossible.
1st: You cannot have ANY of them less than 0. The concept is meaningless.

2nd: Total Chlorine (TC) BY DEFINITION is the sum of Free Chlorine and Combined Chloramines. It can NEVER be less than either of them.

Either the numbers are backwards or the Pool store tested messed up BIG TIME!!!!!

If, actually, the numbers are reversed and TC=6, FC=5.9 and CC=.1, you are in good shape.

The other numbers are fine.

[mbar]

No, total chlorine is free chlorine plus combined chlorine. So if your free chlorine is 6 when you do the test, and you add your 5 drops of #3 and your water turns pink, if it takes 2 drops to get the water clear, your combined chlorine would be 1. So 6 plus 1 would make your total chlorine is 7. You can only get a positive reading for combined chlorine, because if the solution stays clear, then it takes 0 drops to get the solution back to clear, so the fc would be 6, the cc would be 0 and the tc would be 6. Hope this makes sense for you. If not I will try to explain better