When the DSP is the sole or primary water source in the district, adjacent water consumers will receive low-mineral content water continuously. However, when different sources of water are used by the local supplier, water quality for the end users will probably be irregular . It should be noted that desalination is cost-effective only when operated continuously; hence, desalinated water is planned to be the base water resource for supply, while other resources (ground and surface waters) are added only at peak demand .