I think if it were my pool and I needed to add some CYA, I'd just add some straight CYA and be done with it. If you buy the big 50lb. bucket of tabs, you'll have many left over for another year, which is ok if you keep them dry. But, if you don't want to store that bucket, just buy some stabilizer. Or, as Ben also suggested, the bags of shock are dichlor which you could also use and wouldn't have to buy such a large quantity of it....... I don't think. (?)