STS Instruments design, manufacture and sell scientific instruments in the water and waste water sectors and the landfill gas market. STS specialise in novel and niche areas of monitoring including portable fluorimetry for water quality monitoring and analysis of biogas/landfill gas used in CHP plants for damaging siloxane contamination. Their live showcase will demonstrate their online Siloxane Monitor launched this year. The monitor constantly measures the levels of siloxane in the gas feed from AD plants on sewage treatment sites or from landfill gas supplies (usually post any carbon filters) being used in CHP engines. The monitor is used to show the trend in contaminant loading of the filter and to therefore predict the point of filter breakdown and failure. The implication being that filters can be changed at the optimal time, preventing engine damage and managing filter replacement costs.