Our professional team will find the best low maintenance treatment system for treatment of wastewater in rural areas Projects Wastewater treatment plant in Verdú, Urgell Wastewater treatment plant in Can Grau, Garraf. Wastewater treatment plant in Corbins, Segrià La Pleta wastewater treatment plant, Garraf. Wastewater treatment plant in Can Calopa, Collserola, Barcelona Wastewater treatment plant in of Gualba, Lleida.