I think the difference here is biology, Kien and RuGlu6. Slow flow through a media reactor to increase contact time is typically based on chemical absorption and binding with carbon and GFO. Bacteria on the other hand, in ideal growing conditions, can proliferate insanely fast. It's not unheard of for bacteria colonies to double their population in a matter of minutes. Well, anyone who's suffered through a dinoflagellate bloom in their tank has seen this with their own eyes. This is also why bacterial based ULNS trumps algal based nutrient reductions, for example (not that algae doesn't work, but it grows slower).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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