In anaerobic (septic) wastewater conditions, sulfides when not oxidized combine with hydrogen and produce hydrogen sulfide gas producing the "rotten egg" odour and corrosion problems to the collection system pipes. Effective chemicals that can be used to control H2S in wastewater collection systems such as chlorine compounds and ferric chloride would offer a solution provided there are chemical feed systems installed at the pumping stations. These chemical feed systems can be controlled by our continuous H2S monitoring system. The H2S monitoring system also has an integrated logger so that values are recorded to prove compliance with local odour regulations/conditions.