Based on other advice, I got some skimmer "liners" (for want of a better word). These are about $8 for 5 at Leslies and other places. They are a fine mesh, soft nylon (I think) liner that fit right into the skimmer basket. Most people use them to have the skimmer filter out some of the finer stuff so it doesn't hit the filter.
But, they also work great for CYA. I dumped about 3 pounds into one of these in with the filter running and within 24 hours all of the CYA was gone. Probably not completely dissolved, but at least small enough to fit through the really tiny mesh. Plus, these liners filter out a lot of the small stuff that goes right through my baskets.
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