We generally recommend plain, unscented bleach. If you'll post your pool's volume, then we can help you figure out the dose that you'll need, but generally 1 gallon of 6% bleach will raise the FC by 6ppm in 10K gallons of water. In my pool, I use one of the large WalMart jugs (1.4 gallons, I think) every two days to maintain 8 ppm of chlorine. (My pool is high CYA, too, but intentionally).

Now, if you tell the pool store that you're using bleach in the pool, they'll usually go into hysterics and emphasize that bleach is not to be used because of risk to the liner....but I have yet to have a pool store employee be able to tell me why it is that using liquid chlorine that they sell in pool stores (which is 12% sodium hypochlorite) is good for the pool when bleach (which is 6% sodium hypochlorite) is so BAD!!

Janet