As the water sits in the jug under the filter, it gradually loses its dissolved oxygen and ends up tasting flat and stale. This could be avoided by fitting a crank to the side of the jug which spins a water wheel inside the jug via gears in order to re-aerate the water.-- nineteenthly, Nov 24 2007 Quick-Stir® Pitcher https://www.pampere...12064&words=pitcherSame idea, but with a piston, not a wheel [phoenix, Nov 25 2007] Isn't what is bubbling out CO2 and clorine? Wouldn't you need to resupply those and maybe some pressure to get them back in solution?-- MisterQED, Nov 24 2007 Why would you want to put chlorine back in?-- lurch, Nov 24 2007 I don't want to put chlorine back in, but i think you're probably right about the pressure. Maybe two internal cups sloshing the water between them or some kind of piston?-- nineteenthly, Nov 24 2007 I own something like this (link), except the agitator is a piston that moves up and down inside the pitcher, using a handle on the top. It's primarily for agitating drink mixes (Kool-aid, juice concentrate, etc), but would do a fine job of disolving a bit of oxygen in water.-- phoenix, Nov 24 2007 wonder if it would work for my fish...-- pashute, Nov 25 2007 random, halfbakery