Basement and Bathroom Drainage

• 01

  A basement bathroom sits below the municipal sewer, so wastewater has to be lifted rather than drained.

• 02

  Retrofit projects often have a short discharge route with several bends, which reduces the usable head.

Typical lift

3 – 8 m

Typical flow

100 – 150 L/min

Discharge line

Small bore, check head loss per bend

Ranges are indicative of the application, not a guarantee; selection follows the measured site figures.

1. 01

   Set the unit on a level base with the inlet below the lowest fixture outlet.

2. 02

   Keep a full-bore vent on the tank; do not reduce the vent to the discharge diameter.

3. 03

   Fit a non-return valve on the discharge and check it is accessible for service.

Can one unit serve a toilet and a shower together?

Yes, if the combined discharge stays inside the published flow of the selected model. Confirm the fixture count and simultaneity with your installer before ordering.

Does the discharge need to go up before it goes down?

A vertical lift is normal, but every metre of lift and every bend consumes head. Compare the total against the maximum head of the model, not against the lift alone.