Our camp is in Potter county and isn't used as often during the winter months. Typically, the water is drained late October/early November and not turned on again until Spring time. I want to configure drains and a system to make it easy to winterize so the water can be used during winter visits (especially hunting trips). It's a mobile home, so only HW tank, 1 bathroom and the kitchen sink needs addressed. Do you guys use air to purge or simply low-point drains?