They have meters to test ppm. The paintball CO2 tank you saw is a CO2 tank just in a smaller size. Because of how small it is, I'd suggest you not getting one of those and instead getting a scuba sized tank. You can probably find places to fill your tanks around local stores. Paintball stores, usually a sporting goods store, and maybe a hydroponics store. Hell, even home depot or Lowes might fill them (haven't checked). Goodluck.
Da1KrayzieThug Reviewed by Da1KrayzieThug on . CO2 - how to? I have heard a lot of good things about CO2 -- So, I decided to mix one myself. My question is how do I use it? Do I just spray my home made CO2 into the plant? or do I have to add some water afterward? please advise. thanks Rating: 5