Sealing a barrel with Gas

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Olli

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Hi Guys,

Someone was telling me that when drawing cider from the tap of the barrel obviously air has to get into the barrel which in climates like here in Sydney can cause the cider to go off due to bacteria etc getting into it. Apprently the solution for this is to fill in some odorless gas which is heavier then air which is meant to seal it off. I was told that winemakers use this procedure also. Is anyone familiar with this or should i just not bother?
 
Im not familiar with the procedure, but naturally CO2 is produced and it is heavier and will stay on top of the liquid until blown off.
 
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