Keep in mind that the pumice floats because it holds
air. If it holds air, then water can't get in, and
if water can't get in, it cannot denitrify. I don't
think it's totally impenetrable to water, but you
might want to decide, just how much water is
actually getting in.

Wayne Sallee
Wayne's Pets


swarvegorilla wrote on 2/26/2007 11:20 PM:
As a sidenote I have been experimenting with a layer of floating pumice in a
sump
I picked up the pumice stone still wet from the ocean
judgeing by the barnacals it had been out to sea for quite some time
the structure of the stone is such that it should hold lots of nitrate
eating bacteria
well thats me theory anyway