On Mon, 01 Oct 2012 13:23:39 -0400, JKConey
Well, I guess I'm the put my two cents in. I have a 27'Holiday Rambler
Alumascape (2003) bought new. Every year since I bought it I've use
compressed air to winterize the rig. The only thing I use the pink
stuff for is the P traps (kitchen sink, shower, toilet and then at the
sink).
On the water system I start by bypassing the hot water heater and
pulling the plug and draining it. Then I connect an air hose (with an
adapter I made) to the city water hose connection and use about 40#of
pressure. I make sure that at least one faucet is open in the rig
usually the kitchen sink either hot or cold. After all the water is
blown out of the hot I switch to the cold. I repeat this procedure in
the vanity sink and shower. (I almost forgot about the outside sure,
same procedure.) I then go to the potty and pull the flush lever until
only air comes out. My holiday Rambler also has 2 drain line plugs
underneath the coach that runs the length of the coach which I also
removed the plugs until all water is out and replace them so to be
ready when the coach is put back in service. At this time I also
replace the drain plug on the hot water heater and put the hot water
heater back in service. The freshwater tank's drain valve is opened
and left open until the rig is put back in service in the springtime.
After draining all tanks, two graywater & Blackwater. I use 3 gallons
of pink stuff pouring them in the P traps of all the sinks and shower
making sure I pour enough to flush the P trap of water and also I try
to make sure that enough pink stuff gets to the drain valves on the
tanks. I pour enough to cover the potty flush valve to make sure no
unpleasant odors can get back into the rig.
Now, I have a large air compressor in my shop to do this and it works
for me. As far as our winters are concerned the lowest temperature
we've had here at the house since we moved here in 1990 was 16° below
zero but on average it is higher than that.
Hope this helps