Originally Posted by CliffP
You should really pull it back out of the garage! If water freezes in your water filter it could crack the housing and you'd have to replace the whole thing, not just the filter. The water heater should also be drained. Take the access panel off the outside of the camper. There should either be a drain plug (see pic) or I think some models have a heating element to remove to drain tank.
Even if you left water filter in the canister and ran antifreeze through it won't freeze.
My father inlaw did this all the time bless his heart.
His motto was why mess with it twice. This happened every year for 20 years.
And his never froze.
Me on the other hand I take it out since I can just reach into the basement and do it.
I moved it from factory location to just inside my basement door.