Oxidation: Normal procedure for oxidizing a water supply and removing the rotten egg smell is usually specified by the chemical feed pump manufacturer or supplier and depends on water conditions. There are many types, designs and methods of introducing Neutra Sul to the water supply. A normal method is to inject Neutra Sul directly into the water line with the use of a chemical feed pump. Dosage rates will vary. If unsure consult owner's manual. Dosage: Proper dosage rates will vary depending on application. For oxidation of impurities, feed Neutra Sul until there are very few oxygen bubbles in treated water.