ISI - Ultrafiltration (UF) System

Ultrafiltration (UF) is a common pretreatment process used to clean the feed water for reverse osmosis systems. These systems are capable of removing colloidal particles, viruses, bacteria, and suspended solids. UF systems require a Silt Density Index (SDI) less than 5.0, and ideally less than 3.0, for long term use. With UF filtrate SDI levels often reaching less than 1.0, UF is undoubtedly the best pretreatment system for RO.