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Does anyone have any experiences with using this as a substrate? It is inert, mostly amorphous silica, and highly porous but I'm not sure about the CEC. It comes in various grain sizes and the locally available product looks light redish and creamy brown.

Tony Eales
333 Whites Rd
Lota, Brisbane 4179
Ph (07) 3365 6958
Home (07) 3396 8496