Chilled 5 gallons in a little over 5 minutes! 50 foot immersion make with 3/8'' copper tubing. Bend it around a corny keg to shape it, with a spring bender. I was going to order the 50' roll and make a 25' chiller for myself and sell another 25' on ebay. But then I though "Na **** it 50' chiller would be sweeet. And it is.