Photospheres are hollow glass microspheres coated with anatase photocatalytic titanium dioxide (TiO₂) to provide a high temperature, buoyant, filterable, and reusable alternative to solid TiO₂ nanoparticles. This product line was specifically designed for photocatalytic water treatment. Photospheres can be used, collected and re-used, making it an environmentally friendly and efficient product.