DIY CO2 bucket system

Fart on your plants.

Very interesting......

I don't want to be repetitive by posting this every time the subject comes up, but using an expensive monitor I can tell you that I consistently have over 1200 PPM in my entire grow room (12x12x7) using a two-mantle propane lantern. Doesn't add much heat, doesn't need to be on during dark hours, and a grill size tank lasts a month at 12 hrs/day. I could easlily dial in a higher PPM if I wanted to. This really works well for me, and I'll be glad when someone else tries it.

you should be able to make this last a hellova lot longer then a couple of weeks,
I'm pretty sure yeast is a living thing and with the right care can be kept alive, I've heard of bakers with a (sour dough?) culture and they feed it and it lives and grows and the same is true of some brewers.
Just a thought, and possibly a mistaken one.

Amish have a friendship bread doug. they make it split it into seperate bags, give couple to friends with instructions to keep adding ingredients that just keeps feeding yeast growth alive. Have also heard of using or adding every couple of days -sugar or unsulphered molasses to yeast based co2 generators going longer(ur just adding sugar based food to fermentation process) without having to clean out containers that should be sterilized between batches, 5-10% bleach solution works. Not a science head but I know whats been working for me for a yr. I have left go too long & it gets to a strong stale beer smell. I have also told to hang or deliver above plants. thanks for all the info I've found shared on net.