Sherra,
Cal-Hypo that is 65% pure and (it turns out) produces about 65% available chlorine has 1 pound equivalent to 1.22 gallons of 6.15% bleach (typical Clorox regular bleach). It would take about 1.06 gallons of 7% Ultra bleach and about 1.42 gallons of 5.25% bleach.
1 gallon of 5.25% bleach is equivalent to 0.69 pounds of 65% Cal-Hypo while 1 gallon of 6.15% bleach is equivalent to 0.82 pounds of 65% Cal-Hypo.
Hope that helps.
Richard
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