All this being said, i think you can just remove the air valve and pour some in the bags. Then run your pumps on drain until you see it come out. Completely drain it all if you can. I don't like that stuff sitting in the ballast bags. If you ever used this stuff to winterize your toilets in a cabin you will see it scum up over time. I let it sit in the traps, but don't like it sit for long. Not sure if its good for rubber long term.