• Ozonation within the treatment stream will also provide a high degree of security, particularly if it is installed for removal of pesticides or taste and odour compounds, by achieving very effective inactivation of most micro-organisms and also, in some situations, by reducing chlorine demand.

• Surfactants can be used for the removal of a wide number of contaminants; however, elimination of polyaromatic hydrocarbons, oils, and pesticides is the most important.

• Mercury was injected as Hg(II) which is the fully oxidized state, so oxidation was not the mechanism for removal.