Aerobic biofilter

The Black Phoebe (Sayornis nigricans) is a distinctive tyrant flycatcher native to western North America, ranging from southwestern Oregon and California to west Texas and northern Mexico. In South America, it can be found in the Andes mountain region, ranging from Colombia in the north, south to northern Argentina. The Black Phoebe reaches a leng...
Found on http://en.wikipedia.org/wiki/Aerobic_biofilter
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