Janet,
Again thank you. I did use an OTO 6 way test kit from Walmart. I'll have to get some cyanuric acid from the store and I think I'll use the old sock trick you mentioned as within a week I would probably need to backwash anyway. I really didn't use any cynauric acid last year because like I had mentioned before it wasn't staying and the test kit said a minimum of zero was ok. Before I do the cyanuric acid I will do the chlorine shock level (12-15 ppm) for a few days to try to clean up the yellow in the deep end. Wouldnt do any good to crush up vitamin c tabs as the yellowing is in the deep end about 8 feet deep or so. Can't hold my breath that long can't even swim as I am only the caretaker of the pool for my wife, kids, grandkids,etc. Can you believe it? Thanks again.