With available technologies, any water quality required by users and for compliance with
existing regulations can be achieved. Extensive or intensive technologies can been applied,
depending on local conditions, intended use of the water, plant size and water quality
standards (Lazarova et al., 1998). However, costs may vary widely, making the choice of
the most appropriate technologies a sensitive decision. In a number of Mediterranean countries,
the choice of treatment technologies will be determined by the ease of maintenance,
reliable operation and low O&M costs of reclamation plants.