“Aerobic organisms are the most beneficial as they promote the processes that a plant needs in order to grow without stress and with a greater resistance to disease.  To enhance this community of beneficials, the compost tea must remain aerobic. Anaerobic conditions during brewing can result in the growth of some quite detrimental microbes and also produce some very detrimental metabolites.  It is best to avoid extremely low oxygen concentrations during brewing.”

Soil Food Web Institute