I really don't use it any more.Nice. What's the refill cost/rate?
My Co2 is around 1600ppm because I'm growing inside,
in a room I'm in at least 12 hrs a day... I'm my own Co2 generator...
But when I did use it, I filled it with this...
$10 gets me 15lbs of Co2... I've never refilled the tank for my grow,
but I didn't waste any with the tent holding it in...
I found that 6000+PPM will make short work of fruit flies,
but the plants didn't seem to notice... that's when I stopped using it.
-Loki