My combined chlorine is 0, FC still holding today and those darn caterpillar look-alike plant part things that come off the trees in spring are attempting to take over the pool. I have a DE filter, and today I did my annual breakdown and cleaned and recharged the grids with all new DE. I'm going to stick with the plan of clean, clean, clean, and then clean some more. I was running the filter 24/7 when I started bringing up the CYA, but I cut it back to 10 hours after my chlorine level stabilized. With all the debris from my neighbor's tree coming down I'm having to run it 24 hours a day again I do like the skimmer socks and will give those a go too. Thanks for all the help guys!