Reliable source of water that is not subjected to seasonal changes in or weather events.
Generally minimal usage of chemicals
Minimal environmental impact.
Plants can be modular in design
Easily expanded to meet changing demands.
Water price can be fixed and/or linked to inflation for the duration of the agreement.

Great care and staff expertise required to minimise rate of membrane replacement.
In case of open-sea intakes, there is chance of interruptions during stormy weather.
High importation costs.
Usually need foreign expertise, with a commitment of foreign exchange.
Many dissimilar components used
Highly varied spare parts inventory required.