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Many use LavaRock as a substitute for BH media and I am a big fan of the stuff. You also might want to check into Feather Rock as a possibility. It is very lightweight, easily broken/cut/carved into smaller pieces, and extremely porous. The porous structure of the stone should make it an exceptional media for bacterial growth.
I plan to use some in my filtration when I finish up our remodeling, but I'm not quite there yet. According to Doc Conrad roughly the same amount of water passes through the stone as passes over it, which should make it a good performer in any type of shower or tower.
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Larry Iles
Oklahoma
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