There is no need to drain the entire contents of the tank every time it's used. The water will settle to the bottom (hopefully where the drain is). Just crack the drain now and then and let it run until it blows just air with no water. If it's a large tank, take the time to replace the junky screw type petcock that they use for the drain, with a nice ball valve and maybe several inches of pipe to get it out where you don't have to crawl under the compressor to get to it. If you can't get to it, you won't drain it. <img src="/forums/images/graemlins/cheers.gif" alt="" />