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I've been preaching this forever on various forums (incl. this one in the past) but no one is willing to listen, so I'll just give the short version this time: effective CO2 enrichment is far, far beyond "the bottle" (or bucket, or burner, or whatever your method of production is). Unless you have a method of correctly dosing the right amounts and maintaining (that's the key) those levels in that environment (and that environment must be pretty ideal to begin with), all you will obtain is a placebo effect and an empty wallet.
The best thing you can possibly do as a "small grower" for CO2 enrichment is to invest in a larger intake/exhaust fan and up the number of air exchanges per minute. This will give you actual results, while most alternatives will give you, at best, a placebo effect.
By the way, your environment (temp/humidity, mostly) will make a huge impact on how much CO2 is taken up by the plants. If I run my room at 75-77F, 1500ppm -> 0ppm will take much longer w/ the tank off than at 83-85F.
sleep ................................................0.3.....0.013
resting or low activity work....................0.5.....0.02
normal work......................................2 - 3.....0.08-0.13
hard work.........................................7 - 8......0.33-0.38
