Prokure D - 50 Gram Chlorine Dioxide Extended Release Gas, 4000 cu. Ft., Case of 12 PacketsExtended Release Gas uses Chlorine Dioxide to control odor over a long period of time. As a cultivator, maintaining a consistent grow environment is critical. Thankfully, ProKure products can address a wide range of the most common cultivator issues, depending on the product series and ClO2 concentration levels. The ProKure D Extended Release Gas product line emits very low levels of ClO2 gas vapors via a humidity activated delivery system. The trace