Your math is a little off on this one. One pound of that cal-hypo will raise your FC by 9.7 ppm. One gallon of 10% will raise it 15 ppm. You need 1.5 bags of 54% cal-hypo to equal 1 gallon of 10% liquid chlorine.
@Zone Yes, that is 12.5% liquid chlorine and a good choice for daily chlorination.