I've been using a racking cane for years but picked up one of these recently because that was all they had at the store. Is there a trick to getting it to work when you only have a half batch, say 3 gallons? The liquid falls back down into the autosiphon into the carboy rather than down into my bottle bucket. Not enough of it clears the crook in the cane to travel down the tube and do the work need to start the flow. This was one of my frustrations when I first used autosiphons years ago and it has come back to haunt me.