Each year I do the winterizing like was told, buying the anti freeze, etc. But, I had a thought...If I drain the water out of each line, empty each tank and hot water hearter, why do I need anti freeze? Even if I left a small amont of water, wouldn't there be enough room to accept any expansion from water to ice? This would be in the low area away from any faucets or valves. At the golf course each year we blow out the irrigation lines using compressed air. Its the only way to remove the water. But, we do not add any anti freeze. Its not that I'm too cheap to buy the anti freeze. But when it gets dark this early...my mind wanders!