How To Clean Draft Beer Lines 

There’s no faster way to ruin the taste of your draft beer, then by not keeping your draft lines clean. All sorts of nasty things can collect or grow in lines that aren’t kept clean, including bacteria, mold, yeast and sediment (beer stone). These contaminants can create foaming and taint the taste and aroma of your beer.
It is recommended that you clean your draft lines with beer line cleaning solution a minimum every two weeks or, at least, every time you change kegs.