Can't tell you that but.....
Most bleaches are 6% Sodium Hypochlorite by weight.
So 6% of the total weight of 1 gallon (ex: Chlorox Bleach) is SH.
Can't tell how much of the powder you have is filler by weight unless it's 22% of the 1 pound package you have. Which would make it 78% SH by weight. So if a gallon of water weighs 8.34#, then you would have to take 6% of that from the 78% granule ....
If so, then 12.48 oz. of the 1# package is SH. 1 gal. water is 133.44 oz. by weight (6% = 8 oz. by weight). 78% concentration would need 10.26 oz. of your mix (if all else I've assumed is correct). I hope someone is checking my math.
But it doesn't look right - that a 1# bag would only make the equivalent of roughly 1-1/2 gallons of 6% liquid chlorine.
Who knows ????
I'm not sure if they grade SH the same as acids (20 Baume, 21, 22, 23, etc.)
Some of the granules are actually Sodium dichloro-s-triazinetrione, Dihydrate which even at 99% active level will only give you 56% available chlorine (one specific brand). Then there are others that are 97% active and still have 89% available chlorine, then a 3rd one I looked at has 99% active and has 90% available chlorine.
Best bet is to work with your pool supply shop or the manufacturer based on the specific product. Ask them how you should mix it with water to get you to 10-12% chlorine level.
You could also play around with an electronic PH meter (sold at pool supply shops) or have the pool supply shop check. I'm not sure how accurate those are but it may get you into the ballpark.
Let us know how you come out in the end.
Regards,