In my area you can get a pre-made fountain that screws into the return for between $5 and $10. These tend to aerate even faster than a gang of splashing 12 year olds!

'Bear has given us the best lesson yet on TA and out-gassing. All the others have been far more technical in terms of language and terminology--this puts it in terms of seltzer water and flat soda. We all understand that and the chemistry is the same--'Bear isn't using an analogy, just showing us out-gassing we all understand--flat soda.