I am also in Atlanta and swapping them is all I have heard of .A.B. makes a c02 filter you that supposedly prevents that trash from mixing with the beer.Most of my expiereance is from the beer and restaurant industry but there are several gas companys in the metro atlanta beverage cotrol and nuco to name a couple that provide food grade gas mixed gas only comes in the nitro fitting bottle (bottle has female connection as oppsed to c02 bottle having male connection)
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