Standard aboveground STPs have a double-walled, fully insulated tank designed to be installed outdoors above the ground surface. They are available with or without a built-in inlet lift station (depending on the elevation of the sewer line coming from you house compared to the elevation of the STP). All STPs have an effluent pump. Drawings for a simple treated timber foundation are available.
Uninsulated aboveground STPs are available for installation inside a heated enclosure.
Standard belowground STPs have a single-walled, fully insulated tank designed to be installed below the ground surface with 4 inches to 4 feet of soil cover. Every system has an effluent pump, so treated effluent can be discharged either above or below the ground surface.
The following optional equipment is available for residential or small commercial use:
- Built-in lift station (to lift raw sewage up into an aboveground treatment plant)
- External arctic outdoor lift station (that can be mounted to the outside of a house or be set partially into the ground)
- Thermosyphon (to keep the permafrost beneath the system frozen)