Well like Brad said, it's hard to get even double the gallons in pounds of rock into a tank. Three times has more to do with the density... or getting ripped off by the LFS. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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