How to Install an Effluent Septic Pump

A septic system lift pump pressurizes and distributes waste water in a drain field. Failing lift pumps draw additional energy and can insufficiently pressurize the drain field. Typically, lift pumps that aren't operating properly have been submerged in sewage for years and have simply worn out. To ensure that you have a properly functioning septic system, lift pump sizing and correct installation is critical.

Things You'll Need

• Effluent septic pump
• Pipe wrench
• Rope
• Alarm float
• On/off float
• Rubber gloves
• Polyvinyl chloride (PVC) saw

Instructions

Preparation

1. Consult the original design of the septic system.

2. Review information pertaining to lift pump head and gallons per minute. Pump head is the force the pump generates, and gallons per minute refers to the flow generated. Plumbing supply retailers will require this information to order the replacement pump.

3. Schedule a tank cleaning from a reputable septic tank cleaning company to remove all waste water and organic material from the septic tank.

Lift Pump Removal

1. Shut off the breakers for the lift pump circuit and the septic alarm circuit.

2. Unplug the pump and remove the wire nuts on the wiring for the alarm float switch.

3. Locate and disconnect the union fitting that holds the pump plumbing to the drain field plumbing. Cut the pipe with a PVC saw if no union fitting has been installed.

4. Lift the pump out of the tank with the lift rope.

Lift Pump Installation

1. Unscrew the upright pipe connected to the old pump counterclockwise. Use a pipe wrench to start the fitting turning.

2. Screw the upright pipe clockwise into the housing for the new pump. The fitting should be tight.

3. Replace the float switches at this time. Take note of their location and the length of wire from the fastener to the end of the float. Install the new floats to the same specifications.

4. Tie a new lift rope to the pump handle.

5. Lower the lift pump into the tank, placing the pump on the raised portion of the pump chamber to keep the bottom of the pump out of the sludge layer. Lift only on the lift rope.

6. Reconnect the union or install a union fitting at this time, using PVC cement and PVC primer.

7. Install the alarm wiring by connecting the like-colored wires together and then twisting the wire nuts back onto the wires. Gently tug on the wires to make sure they are secure.

8. Plug in the pump and turn on the breaker for the associated circuits.

References

• University of Minnesota; Onsite Sewage Treatment Program: Manual for Septic System Professionals in Minnesota; 2009

Resources

• Environmental Protection Agency; A Homeowner's Guide to Septic Systems; Mar. 2005
• University of Minnesota Extension: Septic System Owner's Guide; Laurie Brown, et al.; 2008