I have just bought a 5L kegerator system for my office & would like to start bringing my homebrew in.
What do I need to get started? Can I re-use purchased 5L kegs or are there any retailers around that sell empties?
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There is some good information here on reusing them also: http://forum.northernbrewer.com/viewtopic.php?f=3&t=90461&start=0
Directions taken from minikeg.net.au.
You can buy new or used kegs, but keep in mind that mini kegs are usually harder to find than full size cornies, and can thus be 2-3 times more expensive.
Details about usage (priming, tapping, cleaning, sanitizing, etc.) are given here. If you buy used, it's a good idea to ensure that it's been pressure tested before you buy, and pick up some spare o-rings.