The only reasonably affordable way to reduce CYA is to drain water out of the pool and refill it. This same problem is what brought me to TFP last year - I ended up draining and refilling - it was worth it!
Thanks. I don't have too much CYA in my water (I'm running around 50), but a co-worker does. I myself was wondering about it because I was going on a 2 week vacation and was wondering if I could use tablets and have a 'quick and easy' way to get the CYA down if it got too high. Looks like this is a money grab.