Reverse osmosis is the process of water solution separation by means of their filtration through semipermeable membranes at pressure exceeding osmotic one.

Electrodialysis represents a process of demineralization of water and other fluids containing ionic form impurities using a constant electric field and selective ion-exchange membranes.

Ultraviolet is an electromagnetic emission with a wave length from 10 to 400 nm.

Ultrafiltration systems may be used to produce drinking water from any surface water source.