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Cap'n I wouldn't be too concerned about it . I think its semantics. Is it chemical because it binds materials that are attracted to the water air interface to the bubbles because of opposing charges on the materials and the water molecules? Or would a molecular change need to occur such as in denitrification to be chemical,?Wait a minute that's biological oops. Carbon attracts molecules the same way bubbles do doesn't it. Now I'm confused. I think knowing what's going on in a certain process is alot more interesting anyway. And I think the way Percula 9 wrote was clear and well put.
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Tom
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