London's industrial history has left a troubling legacy of contaminated land and water, particularly in the rapidly redeveloping Lea Valley and its post-industrial brownfield sites. This design research project addresses the challenge by exploring clay-based strategies for regenerating the Lea Valley Filter Beds in the face of increasing pollution and climate change. Through site-specific ceramic prototypes, model-making, and drawing, the research builds upon the work of the Save Lea Marshes group, which aims to redevelop the Lea Valley Filter Beds site. The project investigates the use of ceramic glazes and clay derived from nearby polluted materials, transforming the problematic context into a source of positive value. By developing a language of earthen and ceramic construction, the design celebrates the soil elements of this polluted site as valuable resources.