TRUMPF, a manufacturer of laser diodes made from Gallium Arsenide substrates (GaAs) wafers, needed a practical, cost-effective wafer-thinning wastewater treatment process that would also allow them to meet local regulatory discharge requirements. To better understand the effects of the different treatment stages on arsenic within the wastewater management system, TRUMPF installed the MetalGuard™ Arsenic online arsenic analyzer to measure influent and effluent arsenic levels in real time. The MetalGuard analyzer provided TRUMPF with accurate and reliable results to measure the performance of its IEX system and ensure regulatory compliance. The wastewater treatment approach that TRUMPF introduced resulted in several process improvements, providing an estimated annual cost savings of more than $150K with an ROI of less than one year.