Ultrafiltration plants use membrane technology to remove some bacteria and fine suspended solids up to 0.01 microns. It uses a semipermeable membrane to separate pollutants to give clear water. Ultrafiltration is used in water treatment as well as wastewater/effluent treatment as a polishing step after sand and carbon filtration. It is also used as a pre-treatment before reverse osmosis.

Reverse Osmosis is the finest filtration technology that exists today. The semi-permeable membranes remove, 99% of all salts, suspended solids and viruses to give a very high quality permeate. High pressure is used to overcome the osmotic pressure of the water to remove all contaminants through the reject line. Reverse Osmosis is used not only in water treatment but also in wastewater/effluent treatment as a polishing step to allow for reuse.