Co2 Boost RefillCO2 Boost recharge is only useful for growers who already have the diffusion pump. 100% natural and odourless booster CO2 Boost contains no sugar, yeast or other chemicals. Constant diffusion of about 10 ppm during the 3 months of its yield period. Stimulates plant growth, growth rate and yield. Its components can be recycled as a high yield fertilizer once the product has expired. It does not produce heat or flame. It does not require daily