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CO2 Regulator operates on a CO2 tank to regulate the amount of CO2 released in your greenhouse or grow room. CO2 and light are the key elements for photosynthesis, the process that plants need to make food for themselves and is key to nutrient uptake. Ambient CO2 levels in a room are around 300-500 PPM CO2 and you can actually increase levels up to 1500 PPM to see faster growth rate, increased yield, and happier plants. If you can't add CO2 just yet, be sure to have proper ventilation to spread that natural CO2 around.