Orenco® Biotube® FT-Series Residential Effluent Filters remove about two-thirds of suspended solids from effluent, helping extend drainfield life. They are used in new or existing tanks, for residential and light commercial use. Biotube FT-Series Residential Effluent Filters install on the Schedule 40 or Type 3034 outlet pipe in the septic tank. They come with a filter cartridge, PVC housing, and an extendable PVC handle.