Addition of Thioguard magnesia to municipal sanitary sewers offers a wide range of benefits to wastewater professionals. Thioguard provides effective control of hydrogen sulfide and other acid gasses. This in turn greatly reduces odor and corrosion and substantially prolongs sewer life. We encourage entities dealing with these problems to routinely measure, record and chart the surface pH of sewer structures. This simple procedure is an inexpensive and accurate means to monitor and forecast infrastructure condition.