26 Aug 2026
UCT's Water Hub is making strides in green infrastructure and learning from dedicated water testing
On 26 August 2026, SmallTalX® was delighted to welcome Prof Kevin Winter to the Franschhoek Theatre for an illuminating talk on the Water Hub’s pioneering work in nature-based water treatment.
His presentation offered a compelling glimpse of how science, ecological thinking and community participation can come together to address one of South Africa’s most pressing environmental challenges: water pollution.
Based in Franschhoek, the Water Hub is a research and demonstration facility associated with the University of Cape Town’s Future Water Institute. Working with the heavily polluted Stiebeuel River, the team is exploring how contaminated water can be treated close to its source, using natural processes rather than relying solely on conventional, energy-intensive treatment methods.
The approach is both ingenious and grounded in ecological principles. By adapting old drying beds at a disused wastewater treatment plant, the researchers have created biofiltration systems containing stones, coarse sand and biochar. As polluted river water moves slowly through these filter beds, naturally occurring microorganisms help break down contaminants, while plants absorb excess nutrients. Inspired by the way healthy wetlands filter water, the system demonstrates how nature itself can become part of the solution to pollution.
The results are encouraging. Research at the Water Hub has shown substantial reductions in harmful bacteria and excess nutrients, including ammonia and phosphorus, which can contribute to damaging algal blooms. The system also removes significant quantities of certain pharmaceutical compounds and microplastics. Approximately 50,000 litres of contaminated water are treated each day, with around 3,000 litres reused to irrigate vegetable gardens managed by young women from the nearby Langrug community. These gardens offer opportunities for food production, skills development and small-scale enterprise, while the remaining treated water flows back into the river.
What makes this work particularly exciting is its potential to connect environmental restoration with practical community benefits. By treating and reusing water locally, nature-based systems could help strengthen water security, support healthier river ecosystems and offer additional options for communities facing overstretched infrastructure and scarce freshwater resources. Although they cannot replace the need for properly functioning municipal wastewater treatment works, they demonstrate how decentralised approaches can complement existing infrastructure.
Prof Winter’s work also highlights an important lesson in ecological literacy: rivers are not isolated channels through which water simply flows towards the sea. They are living systems, connected to the surrounding landscape, human settlements, soil, vegetation and the wider catchment. Pollution entering a river upstream can affect ecosystems and communities far downstream, while restoring the natural processes that sustain these systems can yield benefits well beyond the immediate site.
For Franschhoek, this research offers an especially meaningful example of how local environmental challenges can become opportunities for innovation, collaboration and learning. It invites us to reconsider wastewater not simply as something to dispose of, but as a resource that can be recovered and reused when managed responsibly.
We extend our heartfelt thanks to Prof Kevin Winter for sharing his research and vision with the SmallTalX® community. His talk left us with a sense of possibility: that by working with nature, applying sound science and involving the communities most affected, we can begin to develop more resilient and ecologically informed approaches to water management in Franschhoek and beyond.
Read more: How a simple biofiltration system is helping clean up a polluted river — Prof Kevin Winter’s article in Daily Maverick, first published by The Conversation.