What Jay recommends here is faaaar superior to trying to 'brew' with an aquarium pump and airstone. Unless you limit your container size to half a gallon to a gallon you probably will not output enough air to sustain the dissolved oxygen at 6 PPM which is necessary for the survival of aerobic microbes.http://www.microbeorganics.com/#So_You_Wanna_Build_A_Compost_Tea_Brewer
Wow thats cool. Kind of a "less is more" thing. Well I'm glad to know that's the case. Can I do this whenever I want, or do I need to limit it?