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When I purchased my beer kegging supplies the keg came used, complete with some flavor of Canada Dry residual liquid sloshing around inside. It’s common to buy used kegs for home brewing, and I knew that before I used it I’d have to rebuild it and replace all the o-rings to ensure no off flavors contaminate the beer.
This evening I pulled the keg apart, scrubbed all parts with a sodium percarbonate solution, then reassembled it with food-safe grease and new seals. After assembly and pressure testing I filled it with filtered tap water and set it up as seen above. This 15psi supply of CO2 should force carbonate the water to 2.5 volumes (or so) of CO2, depending on how cold the water actually ends up. After proving out that this method works I’ll then try it on one of the future batches of beer, carbonating it either in the garage or a kegerator, if I assemble one.
For more information on force carbonating, take a look at this article.