I currently work in a pub that sells 3 different ales we only ever have 2 on at any one time however we have 3 pumps in the bar.
Recently there have been arguments about keeping the beer on separate lines (each beer on its own pump) however the manager of the pub thinks that the beer line is clean once water is put though the unused pump and therefore any of the other beers can go onto this pump straight away.
He then repeats this process throughout the week. my argument is that by doing this he risks cross-contamination within the lines who is right me or him??