Winterization

That is an honest question.  For 9 of the last 10 years we have used compressed air to blow out our 177 in northern Michigan where it is not uncommon to hit -25 to -30 C during the coldest part of winter in January.  We use a total of 16 oz. antifreeze for our shower and 2 sink traps and just a little on top of the toilet to keep the seal moist.  IF you were to take all the water out of the traps you would NOT need any antifreeze except for the toilet seal BUT you may regret the smell factor from the gray and black water tanks seeping into your pod all winter long.  I prefer using 1 pint antifreeze to avoid the smell.