The Side-Stream Assembly monitoring system maximizes corrosion inhibitor efficiency, essentially paying for itself in about one year through savings on corrosion inhibitor costs. Installation is quick and does not require plant shutdown. The assembly includes multiple, easily connected 1-in. tees. Each tee can be specified with one of several corrosion management and process monitoring technologies, including: Microcor corrosion and erosion rate measuring, Corrater linear polarization resistance (LPR) and galvanic measuring, bio-probes, coupons, and process parameter measuring.