Tony help us to find how to produce cheap Co2, at this time we can show 2 system of production : 1 with vinegar and baking soda the other with fermentation. Look at this system and try them, make them better and let us know about your own system :)
it is a simple system. You make a slow flow of vinegar into a jar of baking soda or sodium hydrogen carbonate (NaHCO3) and the chemistry makes H2O and CO2. Instead of baking soda, you can use Calcium Carbonate. When the jar is full of liquid, pour it away down the toilet. Simple and clean.
I have found that the most important part of the system is the valve. The
flow of vinegar must be very slow, about one drop per second. If the vinegar
flows too fast, sometimes the mixture bubbles up and escapes down the tube to
the plants, and they do not like this mixture on their leaves. Use waterproof
glue to make the seals. I found out that 1 liter of vinegar and 100 grams of
baking soda makes about 1 cubic feet (1ft x 1ft x 1ft) of CO2, and this makes
a high concentration in your grow closet for up to two days. So, you can run
the system once every two days and this will be enough to boost your plants
It is important to have a good valve, slow drops, and good seals to make sure the gas flows down to the plants. If you use the system in a closet, any CO2 that escapes will stay in the room for the plants to use anyway, so the system works, even if the system is not sealed or closed. When all the vinegar has flowed into the baking soda, you can get some more CO2 by gently shaking the container a little. The mixture will become fizzy for a while. Shake again an hour later, and again, until there is no more fizz. This way you get the most CO2 from your chemicals.
I used 5mm plastic poly tubing. You can buy this by the meter in large hardware
stores. You can also buy it in shops that sell equipment for making wine or
beer. You will need about 1.5 - 2 meters of tubing.
Look at the pictures of my CO2 system in action. You can see I used old milk containers, so the system can be very cheap.
I saw some advice on Overgrow, about producing CO2 by fermentation. It does not produce high concentrations, but produces a steady, fairly constant medium-level concentration of CO2 in your grow area. I think it is possible to use this system as well as the baking soda system if you have a little extra space in your marijuana growing room. For me, I have enough space to run both systems, so I have made a first version of the fermentation system. In my country, milk is sold in plastic containers. I buy my milk in 2 liter lots. So I used an empty 2 liter milk container (washed out, of course). I put 1.25 liters of water in a pan and warmed this a little, to help make a solution. I added 0.5 kilos of sugar and stirred the mixture until most of the sugar had dissolved in the water. Then I added a small packet of yeast and stirred the mixture. Then I poured the sugar, water and yeast mixture into the 2ltr container. Put this in your grow room without a top. The mixture will fizz and make bubbles, sometimes so big they might escape the container. Maybe wait one hour until the mixture settles down, then screw on the top of the container (which you have made a hole in to fit the pipe tube). Put a tube into the hole in the top of the container and seal the tube area with clay or something like that. Then the CO2 made by the yeast as it ferments the sugar solution will escape down the tube to the plants, as with the baking soda system. If you have no room for this system in your grow area, you could put it outside and have the end of the tube near your closet's air intake hole, so the CO2 will go into your grow area and boost your plants' growth. I have tested this system and it seems to work. You can see the bubbles of CO2 being made in the liquid and escaping to be released at the top of the container. It really makes quite a bit of CO2. This mixture will make CO2 for maybe two weeks. You will see that the mixture makes less bubbles as the days pass, so when you see it is making very few bubbles, you can make a new mixture in a new container and start the process again every two weeks or so. This system costs very little to make, and to replace the mixture is also very cheap.
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