If you have ever drained your compressor tank, you would not even think once about using it for brewing! Depending on your humidity as the air gets compressed water will pool in the tank. There is a drain valve on the bottom to let this water out. WARNING !!! Make sure the tank is empty then open this valve and take a look at what comes out. I did this after about a month or so of use, the only thing swamp water has over this water is mosquito lava. And don't think that this water in not being blown out through the hoses. Run the air over a paper towel a few times and take a look, it will be damp for sure.