Yeast in sugar=good. Yeast in fection=bad.

[Chronisseur]

This post is to advocate the use of yeast in any closet/cab grow.
After my recent findings I definately give this method of co2 the Chronisseur seal of approval!:thumbsup:
(I've even put a dish in my bedroom in hopes of putting on a little mass myself:D)

[TheGanjaKing420]

LOL @ the title :D

[jaGerbom]

lol nice title. but explain what this yeast thing does.

[Chronisseur]

The yeast reacts with the sugar to produce a "usable amount" of Co2. I dont think it would be worth it if the rest of your plants environment and health wasnt up to par.(however they CAN use up to 5 times the normal concentration). I also dont think it would be reasonable to use for anything more than 15-20 square feet.

[Unknownfigure]

Interesting. If this actually works, it can improve both yield and quality quite reasonably so, and at little cost. Do you use just yeast and sugar, or do you also put water in it? Do you cook the yeast? Do you heat it up?

[TheGanjaKing420]

My question is, what about your ventilation system? If the system is as it should be, your air volume would be exchanged way before the CO2 could even have a chance to increase from normal air levels. Correct me if I'm wrong because I've thought about giving this a try on numerous occasions but didn't because of the above mentioned problem.

[twoguysupnorth]

google homeade co2. they mostly talk about using it for aquariums but the general idea is the same. it may help, it may not. probably cant hurt. they tell you the best type of yeast, amounts of sugar and yeast and water, and also how to make little dispencers.

[stinkyattic]

cooking yeast kills it.
it needs warmth, but GENTLE warmth- next to your ballast is plenty cozy.
Put the container on a plate, as it tends to bubble over if the yeast get too crazy.
ventilation does indeed remove CO2 from the area along with the stale air and heat.
If you are serious about CO2, the sealed room style is the way to go- it's fairly advanced setup, but the return-on-investment warrants the trouble.

[Storm Crow]

I start my clones and seedlings in a (about) 2' x 2' x 18" cabinet. Practically zero ventilation. I keep a milk jug with a yeast culture going in it. I dump in a little sugar before closing it each time. I'm in there at least twice a day and the jug fizzes away merrily with every spoonful of sugar. I do have to change the culture every now and then- it eventually gets weak even though I change part of the water to remove the alcohol. - Granny:hippy:

[alamagic]

A 2 liter bottle. I put in a cup of sugar, a package of yeast, then fill it up a little over half way with luke warm water. Make a small hole in the cap and insert a 2-3 foot piece tubbing into the air space in the bottle and seal it off with a bunch of tape. After just a little while the liquid starts to bubble and foam a little, fermenting and making Co2 gas. I place the tube so the gases emited fall directly onto the plant. They seem to like it :D It last about four days. When the gas coming out starts to smell like alcohol it is no longer making effective Co2, I was told.