Only used mine a couple of times, but when I got it home I hooked the inlet up to my air compressor set at 40psi and blew all the water out. The manual says you can do that or turn it upside till all the water drains out. I think if cold weather is coming I will blow it out several times, or bring it indoors unless I have to travel with it during cold weather, then the multiple blow out will hopefully work.
Retired and loving it.
Got a new 2014 Grayhawk 31DS
Hoping to get away from the IL winters