Bubbler = accessory for fish tanks it oxygenates the water - cheap under $10 - they also come with aeration stones you can skip them if you want, they just "regulate" the oxygen coming out so you do not sand blast your fish during its "normal" usage.....
Edit to add links:
http://www.douggreensgarden.com/compost-tea-vs-manure-tea-vs-compost-leachate.html
http://www.allthingsorganic.com/How_To/09.asp
http://www.ciwmb.ca.gov/organics/compostmulch/composttea/OtherTeas.htm
Edit to add links:
http://www.douggreensgarden.com/compost-tea-vs-manure-tea-vs-compost-leachate.html
http://www.allthingsorganic.com/How_To/09.asp
http://www.ciwmb.ca.gov/organics/compostmulch/composttea/OtherTeas.htm
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