At 05:09 PM 11/24/2010  -0600, Dave Mcneely wrote:
>so far as water in the water tank and lines on a VW camper?  For
>winter, I normally just drain them, and for winter camping, use jugs
>for water, which I protect as much as I can.  Someone on here
>inquiring about heat mentioned that the water lines froze at 22
>F.  I've normally drained everything as soon as I expect any
>temperatures in the high

They'll freeze at 31.99F if you wait long enough.  Simplest thing is
to drain the tank and pour in enough RV antifreeze to pump through
the lines *and flush out the sink trap.*

Porta-potti in the dead of winter works pretty well with straight RV
antifreeze in the upper chamber.

The stuff is generally colored pink and is clearly marked for potable
water systems.

Yours,
David