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Using Pumice?

Since a lot of substrate methods are being discussed here, I thought I
would throw in another one. I would like opinions on how Pumice could be
used in a substrate. It is high in potassium and magnesium, but low in
Fe. I also understand this is the prime ingridient of the Amano
substrate. Doesnt this stuff float in water?  How could it be used?
Mixed with clay?


Robert Paul H.