REEFCIRCULAR

Turning shell waste into sea life

ReefCircular is dedicated to restoring marine ecosystems transforming shell waste into 3D printed artificial reef structures designed to mimic natural habitats. The ReefKasse system, a modular artificial reef tile, can be easily installed on harbour walls and underwater structures, providing an ideal surface for marine organisms to attach and grow, helping to counteract habitat loss in urban coastal areas. In Hundested, Denmark, 24 artificial reef tiles have been installed to create complex habitats for small fish, seaweed and invertebrates on seawalls and seafloor. The installation process is efficient, taking as little as 30 minutes and requiring no dive teams, making it an accessible solution for biodiversity restoration. The system is currently being tested in clay, which has lower CO2 emissions than concrete, and will be available in shell-based bioconcrete from 2026.