I'm approaching time to dewinterize, and remembered my gravity fill consists of a pipe plug in the top of the fresh water tank inside a cabinet. It's actually higher than the opening of the cabinet door so not a good gravity fill. Has anyone just used the antifreeze hose and pump to inject a clorox-water mixture and flipped the tank fill valve on? Seems like it would work but wondering if it puts too rich of a mixture in the plumbing before it gets to the tank.