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The unexpected results come from measuring dissolved oxygen concentrations at various points in the system. The results indicate that the sand filter high pressure in the sand filter is actually oxygenating dissolving bubbles causing more bubbles to dissolve into the water further. Large bubbles do seem to be removed not removing large bubbles. This requires some major rethinking of the way the system works, especially in improving aerator efficiency and pressure maintenance in the sand filter.
(Discuss modifications you are going to make by the e-mail I sent your group yesterday)

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