External Filter Basins
Orenco® External Filter Basins (FTB) are used to retrofit an existing residential septic system with an effluent filter. They eliminate the need for costly and sometimes hazardous modifications to an existing septic tank with restrictive access openings or to unusable
outlet baffles or tees. External filter basins include a basin, an 8-inch (203-mm) Orenco effluent filter, and a grade ring for attaching a section of riser pipe to the basin.
- Ribbed PVC body
- FRP base
- Extendable filter handle for easy removal
- 18-inch (450-mm) nominal diameter basin
- 12-inch (305-mm) basin height
- 8-inch (203-mm) diameter Biotube effluent filter
- 4-inch (100-mm) nominal diameter inlet and outlet openings
- Orenco Biotube® effluent filter included
- Grade ring for 18-inch nominal diameter (450-mm) riser pipe included
- Additional riser for bringing basin to grade ordered separately
- 18-inch (450-mm) FRP access lid ordered separately
HOW TO SELECT
Step 1: Determine the pump basin diameter.
Step 2: Determine the pump basin height. Basin height must accommodate the pump height, the float switch settings, and the elevation between the invert of the inlet pipe and a point at least 1 inch above the finished grade level. The alarm level should be positioned at or below the invert of the inlet pipe.
Step 3: Select the flow inducer option if required.
Step 4: Select the cleanout vent option if required.
Step 5: Determine if splice box and discharge grommet options are required.