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lol.. i'm glad you posted that picture of your bottle drying stand. I was thinking how I could build one similar to the plastic bottle tree's you see out there. I'm laughing that didn't even think of anything that simple.thought you might find this interesting.. was looking for good way to drain large carboys... built this for wine bottles but decided to add a couple holes for gallon jugs and carboy.
It's sulfur dioxide. SO2.That's the whole idea it's the gas that kills the bad stuff. I'm no chemist but I believe it's hydrogen sulfide.