Free Chlorine problem

[Seadog]

Ok on the tabs , didn't realize that they can cause problems, I am testing with the same brand as always and still no pink at all. is it possible that the chlorine level is so high it will register on the chlorine tab and just bleaching out the free chlorine tab ? can't believe it can be this clear and not have free chlorine. this inline system is called frog and you insert this plastic cylinder that cost like 18.00 and is probably a rip off.

http://www.kingtechnology.com/products/products1.htm

I will get a liquid test kit and check back.

Thanks !!