Free Flow Wines deserves much of the credit for the wine-on-tap craze, thanks to its supply of 300 premium wines from 150 wineries, this article says. The company fills roughly 6,000 kegs with young wine each month and delivers them to more than 2,000 locations. Free Flow's system also allows for environmental savings -- Caesars Entertainment uses it to save more than "4 tons of trash," said Caesars' Chris Picone.

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