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Re: Does bentonite make a good substrate additive for cation exchange?
Wright Huntley <huntley1 at home_com> sez:
> Probably depends on what kind you mean. The "sodium" type that swells
> and gels like mad is probably truly great for CEC. The "calcium" kind
> (aka Fuller's Earth) is maybe not much good, as the sites may be bound
> too tightly with the divalent metals to provide the high CEC. IDK.
> Interestingly, most of the Bentonite I have worked with (drillers mud)
> is also fairly rich in iron. It would be interesting to see if the
> bizarre physical behaviour is or is not a problem in aquaria. If you
> have some and try it, I hope the results appear here.
I was talkin' about sodium bentonite. I have a little "food grade" bentonite
that is used as a clarifier for homebrew beer/wine. It is kind of expensive,
but could be used as a test (a little goes a long way). Clumping cat litter
also contains sodium bentonite, along with who-knows-what. Drilling mud is
probably just about right.
I figured you could hydrate the stuff and pump it into an existing substrate
with a huge veteranary (sp?) syringe.