[jeff5may]

Some things to remember about this invention:

Try to make the seam where the inverted top fits into the bottom as airtight as possible. This concentrates the CO2 inside the trap, helping your brew last longer and smothering more bugs due to hypoxia. It also helps your yeast last longer and make more CO2.

Anything that can feed the yeast can be used as fuel for the trap. The trap is basically a nano-brewery, so any kind of mash or wash that could be used to make beer, wine, or spirits will work. Grains and starches have complex carbs that will take longer for the yeast to digest (thus lengthening the useful life of the trap charge), but simple sugars and syrupy mixes will give off more CO2 faster. This also includes stale soft drinks, fruit juice, sports drinks, energy drinks, molasses, etc. When the bubbling slows, just add an ounce or so of fuel for the yeast to eat.

The spent trap can be used again to trap fruit flies. In the absence of oxygen, the yeast produce alcohol and CO2. If even a trace of air is present, it is easier for the yeast to produce CO2 and vinegar. Since this trap isn't completely sealed, enough air will find its way into the trap to make vinegar. Guess what? Vinegar attracts fruit flies (gnats).