I think this is extremely similar to using an Oil-Dri substrate. Both are a fractionated, kiln-baked clay product, both with high CEC capacity.
Depending on which Oil-Dri product you have, the difference may be in color and grain size.
Also, this product has zeolite - the tiny white chips - which will initially adsorb ammonia. Although, not sure I'd like looking at tiny white speckles in a display aquarium. Used in a pond basket, viewed only from the top, you wouldn't see these. Viewing an aquarium from side-on they may be much more apparent. Generally to use zeolite in an aquarium, they are inserted into the filter in a bag, then removed after your bacterial colonies are established. IOW, used out of sight.
Last edited by Rod Hay; 06-12-2009 at 05:57 PM.