There are many reasons for Tunisian companies to invest in resource efficiency and the Transfer of Environmentally Sound Technologies (TEST) is one of the best options they have in identifying optimal solutions. As one of Tunisia’s leading producer of canned fish, ABCO joined the MED TEST II project, funded by the EU under the SwitchMed programme, after facing problems with their Waste Water Treatment Plant (WWTP) due to excessive volumes of wastewater that exceeded the capacities of the plant. The company managed, with the assistance of the MED TEST II project, identify several Resource Efficient Cleaner Production (RECP) actions that can reduce the wastewater output and concurrently save money in their inputs of the production.