Originally Posted by PHS79
But my big question is what about the water pump? Isn't there water still in the pump that has to come out so it doesn't freeze and break the pump?
The by-pass I showed you goes in place before the pump. So the first thing to have antifreeze in it is the pump. The pump then pushes the antifreeze down the system.
As for it being a "big waste of money"- After buying the kit for $20 it now costs me about $8 per year to winterize with antifreeze. (I buy the antifreeze when it is on sale.) It really comes down to the antifreeze being foolproof; whereas the blowout system has more room for error. And as was mentioned, you still need antifreeze for the traps.
The other good thing with the bypass is you now have a secondary method of getting water. This weekend I went camping and the fill station just before my campground was closed for the season. I was running late and went to my campground; knowing if it came down to it I could use the winterizing line to pump water out of my drinking water jug. As it turned out the campground wasn't busy, so I had time to drive to the next campground to get water. However it was good to know I still had an option.
The other consideration is where you live. Being in Canada where we will get swings where the temp will stay below -20 C (below 0 F) for a week or two on end- you want to use antifreeze. That length of time in that cold; everything will freeze. When the temps swing above -10 (20 F) with the sun you will have the trailer not fully frozen.