I just did some rough calculations, which seems to me to be off. I came up with about an 8:1 ratio needed if using bleach (6%) instead of calcium hypochlorite. (48%) (?) This may be in error bit I got that approx. ratio by experimenting with the "Pool Calculator."

If bleach is .0156 per ounce (by volume) and hypochlorite is .21 per oz., then bleach is approx. half the cost. Doesn't seem right.