TP25-18 The Impact of Metal Surface Roughness on Corrpsion Monitoring Water TreatmentMany industrial facilities wish to monitor the long term condition of their recirculating water systems using corrosion coupons. Multiple metallurgies can be installed in combination, and coupons can also be used to monitor various forms of deposition and microbiological activity. But confusion can occur when coupons from different vendors or consultants are installed, as these may have varying properties, specifically roughness, which impact the