The Nature Organic CO² Generator is created of 100% organic raw material that doubles the amount of CO² in your grow room up to 12 hours a day. We work exclusively with organic waste from the agricultural sector; wood, straw, hay and various grains. Through its unique tested formula of organic bio-masss and expanded bacteria, you can always be confident of a high CO² level +/- 700ppm (Part Per Million). The silent air pump is included and simple to install. Compared to other CO² buckets the ppm level of the Nature2 CO² Bucket will be constant and will not dry out, because of the organic compiled tested formula. The weight of the Nature2 CO² Bucket explains the constant ppm that is promised.