Grow room CO2 can be used to boost the growing potential of indoor gardens. While ambient CO2 levels are generally in the 350-400ppm range, many indoor plants will benefit from increased CO2 concentration. Grow room CO2 is created from a variety of sources. Commercial growers and…hardcore hobbyists prefer to supplement directly with CO2 from 20lb or 50lb containers. Simpler methods of additional carbon dioxide include mushroom bags, green sheets, and passive CO2 bottles. HTG Supply carries everything you need to help your plants grow with CO2, shop now across our selection of CO2 supplies.