You are confusing volume/liquid measure, with measure by weight. 1 lb bags of Di-chlor or Cal-hypo granules should WEIGH 1 lb=16 ounces. The volume measure is irrelevant. The instructions refer to weight. 1 lb of Dichlor powder will add about 6.6 ppm of chlorine to a 10,000 gallon pool, or 3.3 ppm to a 20,000 gallon pool.
If the label says it's 1 lb then it should weigh 1 lb, regardless of volume.
(There is no such thing as "shock" when it comes it comes to chlorinating your pool. "Shock" is a verb, not a noun. What you have is either Di-chlor or Cal-Hypo)
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