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A friend of mine just came back from a local greenhouse with some "Aquatic
Plant Growing Media."  I forgot to write down the brand name.  It is described
as a 100% mineral soil, and makes a bunch of other claims
that all basically say that it has a high CEC, no organics, and no effect on
pH.  The guaranteed analysis states that it is 100% Arcillite.  Anyone had any
experience with this stuff?  Any geologists out there have any ideas as to what
it is composed of?

                                        Dave Gauthier
                                        gauthie9 at pilot_msu.edu