Homegrown Exhale XL Co2 Bag Indoor Gardening Roots & Foliage Mushroom Bags Following the massive success in 2013 of the Exhale Homegrown CO2 bag, an XL Exhale CO2 bag has been released which is over half the size of the regular Exhale CO2 bag. This means that the bags will exhale more than twice the amount of CO2 over the same 6 month lifespan Exhale homegrown CO2 is a more harmonious way of providing your plants with 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. This mycelial mass cultivates CO2 and the microporous breather patch releases CO2 continuously for a minimum of 6 months The XL Exhale cultivator will provide enough CO2 for up to 36 square feet of grow space (6' x 6'). Exhale comes complete and is cultivating CO2 before you even get out of the checkout line. No need to turn it on or off, simply place the XL Exhale CO2 bag in your grow space and leave it alone to do its job DO NOT OPEN the exhale cultivator, doing so will interrupt the cultivation of CO2 and possible contaminate the mycelial mass. DO NOT REMOVE THE FILTER PATCH