On a private party or picnic when we use hand pump to push beer out of a keg the beer can relatively quickly get stale. What can be done to keep the beer in a good quality for as long as possible?
I can imagine that a low temperature and not moving the keg can help. What about air pressure? Is it better to keep it low or higher? I guess that low pressure is better because lower amount of air should dissolve in the beer in such a case. What other factors could influence the beer durability in such a situation?