PV-Series Biotube® Pump Vaults have a smaller-diameter design to fit in tanks with narrow access openings. They incorporate a molded-in flow inducer that houses one Orenco® high-head effluent pump. Effluent from septic tanks or dosing tanks enters through inlet holes around the perimeter of the vault and flows through the Biotube effluent filter cartridge to the external flow inducers. The filter cartridge can be removed without pulling the pump or the vault. The Biotube cartridge filters out up to two-thirds of suspended solids from wastewater effluent in onsite wastewater systems and liquid-only (effluent) sewers.1
Ronald Crites and George Tchobanoglous. Small and Decentralized Wastewater Management Systems. Boston: McGraw-Hill, 1998.