Photosynthesis is the process by which plant leaves make carbohydrates. Sunlight, CO2 and water are converted into carbohydrates and O2 by the action of chlorophyll in the chloroplasts of the plant. Plants growing indoors under artificial light often lack enough CO2 to efficiently photosynthesize. When plants are able to maximize the process of photosynthesis, the result is larger plants with larger yields. ExHale can be used for both vegetative plant growth as well as for fruit and flower production. ExHale cultivates CO2 24 hours a day with no need to refill bottles or use expensive CO2 production units. The power of ExHale lies in the mycelial mass inside the vented cultivator. ExHale®-Homegrown CO2 is a revolution in indoor CO2 production systems. Maintenance Free!! No Heat!! No Electricity!! Just CO2!!