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I agree with the dry ice thing. Around here most stations are trying to meet the mandate to upgrade their tanks and they are using dry ice when they cut them up. I believe the theory behind it is as the ice melts it turns directly into a gas and this gas is heavier then the air and gas vapors thus pushing them out and filling the space only with the gas from the ice.
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"!Ama Sua, Ama Kjella, Ama Lllulla!"
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