I Use the airline tube/powerhead method. connected to the venturi of a powerhead it keeps my U Tubes for my overflow primed, it has worked flawlessly , even the annoying bubbble that gathers in the tube is sucked away allowing full flow through the tubes. and in case of a power outage, and the tubes go dry I am 100 percent confident that when power is restored the tubes are automatically reprimed by the powerheads and back in operation without my intervention.
although bi/monthly maintnence should be performed to assure all lines are clear and everything is up to
par.
