The WW4 Effluent Filter helps prolong the life of an onsite septic system by filtering solids which may cause harm to downstream components such as drain fields or distribution boxes. The WW4 is deal for commercial septic applications with flows less than 4,500 gpd. Multiple units may be used in parallel to accommodate larger flows. The WW4 Effluent Filter screens solids to 1/16″ and is certified to NSF/ANSI Standard 46.