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Stephen Boulet said, in part:
> I thought that the big advantage to the biowheels was not that they
> had gobs
> of surface area, but that they were exposed to atmospheric oxygen,
> allowing a
> much larger bacterial colony than if submerged.
Well, surface area is a part of it. If the pleated polyester wasn't
porous, it wouldn't do much good. The water becoming a film (which
requires a surface area, allows for high oxygen "absorbtion" and
surface area is where the biofilms go to set up housekeeping. So a lot
of surface area is good for biofiltering. You could run the water down
large broad sheets of material but he size is impractical. Marineland
has claimed a phenomenal surface area for the media in Biowheels --
which has baffled those that couldn't think of the material as porously
fibrous ;-) . . . Although Roger suspects that, when they load up with
biofilm, they clog up, becoming much less porous.
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