Thank you very much for your info. I have questons: Can you give examples of the uses of each type of EM. This is strange that I don't find infos about EM2, EM3 and EM4. Only this site here gives infos about that. The official EM traders says that you cannot reactive EMa, because "ineffective" microorganisms can be reproduced. Is that true? Must I produce EM every time I want to make EMa? When you make EMa you have to hold a precise temperature. Is it the same temperature with the producition of EMa of the other types?