DIY co2 for longer than 7-14 days

diagram at: http://bolin.iwebland.com/, sorry about the popunder. feel free
to tell me why this wouldn't work.

* digital timer periodically turns on air pump, forcing air into sugar water
chamber and moving fresh sugar water into the yeast factory
* air injection must be valved, since most timers run for at least 60
seconds, which would inject too much air if left full-throttle
* when fluid level in factory rises, alcohol on surface overflows into waste
chamber
* co2 production remains more level than DIY 2-liter bottle systems
* maintenence consists of topping up with sugar water and emptying waste
chamber.
* vessels larger than 2-liters can be used to extend maintenance time,
without co2 drowning in its own waste and dying off
* higher concentrations of sugar coupled with smaller injections can further
extend maintenance time, at the cost of more co2 fluctuations
* co2 production can be tuned by altering air pump cycles with the digital
timer, and by varying the surgar content of the supply