Project Description

Gordon Institute of
Business Science

The Gordon Institute of Business Science (GIBS), part of the University of Pretoria, offers postgraduate business courses and MBAs. It is ranked as one of the best business schools in both South Africa and the wider African continent.
Picture of suitable offgrid locations for Propelair

With over 550 students, GIBS wanted to find an efficient way to reduce its water use.

The school’s existing toilets were relatively old and had large flush volumes.

So 13 Propelair toilets were installed as a proof of concept to lower water usage across campus.

The Propelair units are now in use in the school’s main reception area, which has the highest footfall on campus. They have been a success with the students, and have saved the school water, energy and money – paying back in just 2.8 years.

GIBS reduced its water use by 86% and 2.5 million litres!


  • 13 Propelair toilets have led to an 86% water saving
  • 2,410,000 litres of water will be saved annually
  • Annual carbon reduction equivalent to 2503.54 kg


  • R120,412.50 will be saved in water bills annually (approx. £5,900)
  • The school is now lowering its bills so much that the toilets will have paid for themselves in just 2.8 years


  • Propelair’s displaced air technology removes all waste with one flush
  • Reduces up to 95% of airborne germs & 99.9% of waterborne contaminants

To learn more about the Propelair toilet, watch this video.