I have a "CO2 boost" unit that works on the same principle of "cultivating". They don't work all that great under normal circumstances as they don't produce a great amount of CO2. Basically they are a miniaturized "mulch pile" in a container, with microbes that break down certain materials and release CO2. If yu have a completely isolated grow space where outside air is not circulated into it, then these would benefit yu. However, depending on the amount of plants yu have, yu may have to have a multitude of these co2 cultivators to be effective. JIMO/E