The WWETCO FlexFilter from WesTech Engineering uses compressible media to provide an efficient solution for CSO, primary treatment, tertiary treatment and industrial water pretreatment. It is a simple gravity system requiring no moving parts. The combination of tapered media compression, porosity gradient within the media bed and a low-flow backwash system make it versatile and efficient. 801/265-1000; www.westech-inc.com.