In your 1994 studies you note that the positive electrode has bubbles coming from it, this is exactly what occurs in SDS-PAGE or any electrophoresis apparatus. I believe this process is the hydrolysis of H2O into H2 and O2. It got me thinking with the superoxide discussion, that the presence of this O2 generator may be what was inhibiting the growth of BGA on the "special" side of the tank. Lobos