Specific amounts of water for growing.

[MegaOctane12]

Co2 can only be used in HID lighting and generally requires an enclosed , relatively airtight area so that you can raise the Co2: o2 ratio. However, this is only needed if you have an enclosed area with high concentrations of o2 (or a lot of plants).

Co2 is only utilized properly by advanced growers who know what they're doing.

And also you need ALOT of light, because lumen intensity is directly related to c02 uptake.