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Re: About CEC ? ? ?
> I am a bit confused as to what in the substrate can
> provide CEC (cation exchange capacity) Is it only
> "clay-like" matter in the substrate that can do this
> or can fish poop, mulm (and decomposed organic
> material in general) also accomplish this--this is
> what I read on the net. Is there any truth to this???
> The article also sited that in nature, some of the
> CEC comes from decomposed organic material, not just
> clay since not all aquatic plants grow where there is
> clay available Also, please mention any other
> material in the substrate that can also accomplish this.
Most peats have some CEC. Porous gravels like pumice are also purported by
ADA to be good CEC sources. I am not personally willing to agree with that,
as I have no references other than a commercial supplier of pumice-based
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