Wow I don't know the reasoning for wanting to blow out the system but I think I could have winterized my 5er faster then I read these posts. I like the pink stuff. Why does every one want to blow out their lines instead of using the antifreeze. If you don't put it in the water heater or tank it won't get stinky funky. The main part I think is to pump out the AF before you UN-bypass the hwh in the spring. Someone let me know It costs like $3-$4 a gal for the camco -100. To me it is just Cheap insurance. So I know I don't have any water laying in a low spot some where.