Hi Ted -
It's the concentration of copper in the water when the tank is copper. The critical concentration is 3 ppm. In a tank of copper, that concentration can occur just by simple equilibrium with water. Copper fittings are much less likely to result in copper reaching a toxic level.
But your thoughts about the biological decomposition of surfaces should be taken to heart. Why do we clean tanks between each run? To prevent the anaerobes from building up and resulting in exactly the kinds of problems you were talking about.
Elaine Ingham
President, Soil Foodweb Inc.
SFI Corvallis, OR
SFI Port Jefferson, NY
SFI Lismore, NSW, Australia
SFI Hilversum, The Netherlands
SFI Cambridge, New Zealand
www.soilfoodweb.com
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Received on Tue Dec 16 2003 - 10:45:00 EST