The recirculating media filter from Clarus Environmental is designed for use in decentralized wastewater treatment applications where effluent quality must meet or exceed secondary treatment standards. Treatment occurs below grade as the fluid trickles down through the pore spaces of the media, where aerobic organisms feed on the nutrients. Effluent leaves the system through an outlet pipe in the bottom of the filter. The filter is highly resilient under various incoming waste strengths and is designed for use with any approved and proven media. Multiple media filters can be used together when greater capacities are needed. Effluent can be discharged above or below grade. Above-grade disposal must meet local health codes or guidelines. 800/928-7867; www.clarusenvironmental.com.