Floating drum gas storage in cold climate

I'd like to build a ARTIBC gas storage, basically a floating drum storage. My question is: This system will stand in the cold were it gets about -10 to -20 °C. Can I use any antifreeze in the water or does this affect the biogas?

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Thomas Henry Culhane:
I have... of course only when using the floating drum for gas storage. Works fine if you have the right concentration for the weather. In Alaska I watched antifreeze freeze, but that was extreme!
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Jeffrey L. Frusha:
A saturated salt solution might be viable, if it's not too cald, which is less toxic to humans and animals, even though it's murder on most plants.

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