Oysteria – Low-Carbon Marine Concrete from Oyster Shells

CalX transforms oyster shell waste into innovative, low-carbon materials, including Oysteria – a 100% natural marine concrete. Developed in collaboration with leading scientific partners such as IFREMER and CNRS, Oysteria uses recycled oyster shells as mineral aggregates and a clinker-free natural hydraulic binder, making it both structurally robust and ecologically compatible.

This solution is engineered for applications in reef restoration, coastal protection, aquaculture structures, and other marine infrastructure requiring durability while enhancing biological colonization. Laboratory and real-world marine testing confirm strong ecological potential, with superior biological capture compared to conventional concrete.

In parallel, CalX is valorising oyster shells for industrial applications such as agriculture, plastics, and construction, creating a circular supply chain in Arcachon Bay, France. The pilot processing unit handles washing, drying, crushing, and grading of up to 1,500 tonnes of oyster shells per year, ensuring local, low-impact material production.

Through Oysteria and shell valorisation, CalX combines immediate industrial applications with long-term innovation to reduce waste, decarbonize materials, and restore marine ecosystems.

The company seeks partners, investors, and collaborators in sustainable construction, marine ecosystem restoration, and circular economy initiatives.