[jfaberna]

In my Convenience Center there is a sticker that gives instructions for both methods, so Keystone must approve both methods. I've been told that rigs leave the factory having been winterized by the blow-out method.

My instructions say that you must blow-out the Black Tank Flush with either method, so while the compressor is out, I do all the lines before pumping in the anti-freeze.

There is too much I can forget with the blow-out method by itself, like remembering to run the water pump for 30 seconds after it's dry.