Ultrafiltration is used for the separation of suspended solids, colloids, bacteria, and viruses. Our UF plants are built with hollow fiber outside-in or inside-out membranes capable of treating several flows of different sources and remove suspended solids, colloids, and all kinds of micro-organisms such as bacteria, viruses, protozoa, germs, and larvae. Ultrafiltration can be used as a very effective pretreatment step prior to RO plants.