| Skimmers do work in freshwater however they are extremely inefficient. The reason that they don't work as well in freshwater is because the surface tension of FW is much higher then saltwater. This high surface tension prevents the hydrophobic end of protien from bonding to air. Even adding as little as one tablespoon/gallon of salt to freshwater will reduce the surface tension drastically enough so that you will get some protein bonding done.
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Michelle
Just because something CAN be done, it doesn't mean that it SHOULD be done!
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