How to Install an Effluent Pump


Read your manual for installation, operation, and safety information. This guide neither supplements nor replaces the Owner’s Manual.

How to Install an Effluent Pump
This text describes the installation procedure for gray water applications only – see elsewhere for sewage pump installation.
If you can purchase the parts yourself, and follow some simple directions, you can do this job in just a few hours. You have the option of purchasing the necessary parts separately, or you can purchase an effluent pump kit that will have everything you need. Make sure the kit includes detailed directions that you will carefully follow! The process, in brief, is as follows.

Cost (0-5 scale): 3
Difficulty (0-5 scale): 4

Items Needed:
• Basin
• Full-flow check valve
• Float switch
• Necessary tools
• Caulk or heavy-duty glue

Step One - Mount the Basin
You will need to mount the basin so that its inlet is lower than all sources of gray water. If the source is a shower, the basin will need to be recessed into the floor. If the source is a sink or laundry tub, it may be able to sit directly on the floor. Make sure that the tank cannot wobble and provides a solid base for the pump. A pump that is not connected to rigid discharge piping can lean or fall over when water enters the basin. All liquid entering the basin will be pumped up and into the sewage system.

Step Two – Install pipe and pump in basin
Attach the discharge pipe to the pipe flange on the pump base. This pipe will probably be less than 4 ft. long. Using good lifting techniques, place the pump and pipe into the basin. Position the pump so that the discharge pipe will align with the outlet hole in the basin cover.

Step Three - Setting Up Float Switches
A float switch is attached near the pump in a way that allows the switch to point down towards the basin bottom when the basin has been emptied. When liquid enters the basin, it will raise the float switch to the point at which the pump turns on. The liquid is pumped up through the check valve and into the sewage system. When sufficient liquid has been pumped and the switch again points down, the pump is turned OFF.

Step Four – Install cover, complete piping, and test the system
Install the basin cover, passing the discharge pipe through the correct opening. Make sure the basin cover’s vent outlet is not plugged or clogged. Install the check valve to the discharge pipe, positioned so that the flow arrow points away from the pump. Connect rigid piping from the check valve to the tie-in point of the sewage system. Properly support the discharge pipe.
Connect the float switch to the outlet and then collect the pump to the piggyback float switch outlet. Pour clear water into the basin several times and adjust the float switch position so that liquid empties as desired. When satisfied with pump operation, close and secure the basin cover.