I understand what you are saying, but I don't think this method "really" produces enough C02 and for long enough, to actually help the plants - C02 is just an added bonus anyways. I think some people get to caught up on this subject.

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I agree CO2 is only effective at certain concentrations and also requires a closed grow room to maintain those levels for the period of time necessary to be beneficial to the plants. A little yeast and a straw is just a waste of effort. Plus most urban areas have plenty of "extra" CO2 anyway, heard of global warming?

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A garden of gratitude must first be cultivated in a mans soul before any seed will grow for him.Hydro Q's
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LOL, right.

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A fan works if you want to keep feeding the plant fresh ambient air, regardless of the CO2 content of that air.

I can't think of a quicker, cheaper, more efficient way of producing CO2 than to just breathe.

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I can think of a cheaper more efficient way! Light your trash can on fire! Maybe I'll post a pick of a flaming trash can next to my plants!

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A garden of gratitude must first be cultivated in a mans soul before any seed will grow for him.Hydro Q's
My Journal

i tryed the yeast an sugar it worked but i had a verry small grow room an i had to keep making the brew becaus after 20% alchol the yeast dies, the room smelt like brewers yeast and my kitchen sink smelt like cheep alchol. i made it in a milk jug w/screw on cap put a hole in the cap run 1/4" plastic tubing out of it to a jar full of water put the tube in the water an move it up an down till the bubbles cobe out 1 every few seconds when it stoped bubbling i made another gallon. you know sometimes its fun to try it instead of buy it, try it if it dont work for u at least you got some shity tasting achol,till u bild that still (hey theirs that new DIY project you were looking for hahaha) oh also instead of using sugar use fruit (better smell an taste)

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if u cant smoke it,breed it or ride it
y would u want it?

That is by no means cheaper than breathing.

Breathing = Free

Lighter = $
Trash can = $$
New, unburnt home = $$$

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LOL I would plus rep ya but I have given out too much today.

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A garden of gratitude must first be cultivated in a mans soul before any seed will grow for him.Hydro Q's
My Journal