aco. care for water aco is one of the world's leading drainage experts with more than 75 years of experience in a wide range of sectors. in December 2016, aco group announced the acquisition of rofo engineering a leading manufacturer and supplier of stainless steel drainage systems and grease traps in South Africa. The aco group also opened a regional office in kenya in 2019 to serve the East African market and in 2020 in nigeria.