I was rather rushed the other day but happened by an isle of CYA Remover. It came in a large bottle. The label said it would remove "50 ppm of CYA in a 10,000 gal. pool" WITHOUT draining and refilling.

I can't tell you how amazed I was. Has anyone else heard of this? I admit I haven't been religiously following the forum as of late, my pool having been to bed until May, but it was a first for me!