* 5 gallon clean bucket W/lid
1/2 gallons of water
* A piece of toast browned and
* A table spoon of dry active yeast (for baking
First boil the water, (this will ensure
clean water) remove from the heat and add the sugar.
Stir until sugar dissolves. Let cool until water is room
temperature (if you don't let it cool down it won't
After the sugar water has cooled, float
the piece of toast on top of the water. Now, empty the
tablespoon of yeast over the toast. After a few days,
the yeast will take over the toast and start making
bubbles (CO2) in the bucket. After a week, the amount of
bubbling (CO2) will increase.
Keep the lid
airtight on the bucket. CO2 travels up the dispersion
tubing, and due to it being heavier than air, falls
directly onto your plants. Timing your exhaust, is
essential in maintaining an effective level of CO2.
Unfortunately the author of
this contribution has not been able to test the CO2
levels produced using his method. Personally, I would
use a CO2 analysis kit to help manage (exhaust timing
etc), and maintain, an optimum level of around 1500PPM.