The purpose of this action is the improvement in the sanitation and purification of the Arrecife Territorial System in Lanzarote and the consequent resolution of the problems of non-compliance with the Water Protection Directives 91/271/EEC and 2000/60/EC, as well as the regeneration of purified waste water to allow its reuse for agricultural irrigation. The current treatment capacity of the treatment plant will be expanded. The new facility will include a tertiary treatment with regenerated water production capacity for reuse in agricultural uses and garden irrigation. To allow the evacuation of the treated flows in the expanded treatment plant, the Arrecife emissary will be operated by increasing the diameter of the land section in some areas and conditioning and replacing defective parts of the submarine section.