The islands of Macaronesia are not spared from the effects of climate change, being very vulnerable to their consequences given their particular geographical situation, insularity, remoteness from the continent, fragmentation, external dependency, scarcity of natural resources, demographic density, dependence on the tourism sector and great biodiversity.

The decrease in their already scarce water availability coupled with a growing demand for water (increase in population, standard of living, tourism, ...) causes a deficit that favors competition for water among the different economic sectors, considerably affecting their global development. 

Under these conditions, adequate management of water resources and reuse of treated water with adequate physico-chemical and microbiological quality is essential and necessary for agricultural irrigation, golf courses, green areas, and other non-drinking water uses, which helps to alleviate its deficit and foster environmental conservation.