You will get it cleaned up, it will take a while, but you will. The filter may look and be clean, the stuff may be passing right through. Good job on the Unicels - let us know how it works.

Don't worry about accuracy with the OTO(undiluted) at high chlorine levels, just use the color chart Watermom linked and make a mental note of the color. You don't need accurate to know you've got alot (OTO orange) of chlorine. When you need accuracy (to check yourself and to determine when you're done) use the K-2006.

Thanks, Watermom, for fixing my typo - I though I'd proofread the post - sigh.