TNB Naturals CO2 Dispersal Canister is the best and most efficient way to get the proper amounts of CO2 to your green house, tent or indoor garden. This product will eliminate the need of dangerous propane burners and regulating equipment. This brilliant way of delivering CO2 into the atmosphere is all natural and just takes 1 litre of luke warm water to activate. Each canister lasts for up to 2 weeks and has the potential to double production on all plants. TNB Naturals Enhancer has outperformed the competition in all tests and studies. Easy to use and doesn't produce heat!