Provide your personal growing operation with its own unending supply of CO2 thanks to the ExHale XL Self Activated 6 Month 288 Cubic Foot Gardening CO2 Grow Bag. This CO2 generator bag is a gardener's best friend. It needs no heat or power to produce 6 months of carbon dioxide to a 288 cubic foot area, perfect for indoor operations or smaller greenhouses. Just follow the instructions and place the bag slightly higher than your plants or near the intake of your air circulation fan to make sure the CO2 reaches every plant. The bag has a shelf-life of 3 months and produces carbon dioxide for a total of 6 months. The sealed plant grow bag lets you rest easy knowing your plants have a 24-hour supply of their most precious resource, all year round. Grow faster and greener with the ExHale XL Self Activated 6 Month 288 Cubic Foot Gardening CO2 Grow Bag.