Orenco® Biotube® FT-Series Base Inlet Effluent Filters remove about two-thirds of suspended solids from effluent, helping extend drainfield life. They have the flow area of a full-size effluent filter in a small package for short septic tanks. Biotube FT-Series Base Inlet Effluent Filters are installed on the Schedule 40 or Type 3034 outlet pipe of a new or existing tank. They come with a filter cartridge, PVC housing, and an extendable PVC handle. An optional overflow plate is available for 8-inch (200-mm) models, to prevent effluent from bypassing the filter if it clogs.