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Hi all,
  Just a quick question about CEC.  The discussion about
aluminum in substrates kicked loose a question about how CEC
works.  What is the primary quality about a given substance
that allows for a good CEC?  Is it particle size or chemical
composition?  I had considered using a 325 mesh silica as an
additive at one point in time, and as mentioned the recent
thread brought it back to my attention.