I have since moved to using an empty keg. I mix up some LLC and push it through each line with an air compressor that I have a secondary (inline) regulator. You need LLC moving through the lines for 5 minutes. This works tremendously well. I place an old fermentor bucket under the tap and push on some old silicone hose leaving the other end draped into the bucket. (That end is never pressurized so no risk of leaks) I run the LLC through my taps, then rinse the keg with fresh water and do the same as above but with fresh, rinse water.
Hey Huaco, I know this is an old post but I would love to see a pic of how you attached your air compressor to your keg to pressurize it. I want to do the same thing.
John