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Aerofilter

Aerofilter (Greek aer, aeros – air, air + fr. filtre, from late armor. filtrum – felt) – the bacteria bed used to sewage treatment with artificial aeration of a layer of filter mediums that increases productivity of treatment facilities.

 
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In operating time our brain spends the amount of energy equal to the 10 Watts bulb. So the image of a bulb over the head at the time of emergence of an interesting thought is not so far from the truth.