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Re: Profile "recipe"

James Ourdhase quotes Shultz:

> "The Clay Soil Conditioner and Aquatic Plant Soil are both 100% arcillite
>  clays mined from various sites in the southern United States. Both are
>  kiln-fired in extremely high heat (up to 1400 degrees F) ovens that turn
>  the clay granules into porcelain like materials with thousands of tiny
>  pore spaces,which hold water, air and nutrients. 

So what makes this stuff functionally different than pumice, which is 
basically a natural form of "sintered glass" ?

Bob Dixon