You can use The Pool Calculator to calculate dosages, but you need to figure out your pool water volume first. 48" tall is 4 feet, but you didn't give the diameter of your pool. Also note that most bleach jugs are either 3/4 gallon (96 fluid ounces) or 1.5 gallons (192 fluid ounces) and not one gallon. Chlorinating liquid is usually sold by the gallon.
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