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I can't remember who, but someone asked what CEC meant.  I found the answer
at the Krib (which never stopped working for me) and decided to post it here
for the other newbies who might not know.

CEC = cation exchange capacity = the ability to absorb positively charged
nutrient ions.

From what I gather this is a good thing and a higher CEC is better.

Lorna (still learning).