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I use my own Home brewing kit to feed my plants Co2, I don't have a Co2 meter or anything to check but when I first started using the Co2 from my brewing barrel I saw the difference in my plants in a matter of 2-3 days.
I don't think the Sugar, water and yeast method works well enough to make a difference, one of my fellow growers was using that method and after 10 days with no noticeable difference he started using Home Brew as well.
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