In this new effort, the research team has developed a paper-based, clear, biodegradable material ... of the material and placed some in shallow water, and others in very deep places.

Cellulose treatment enables creation of optically transparent paper for use a substrate ... by swelling the bundled cellulose fibres in water and then mechanically grinding them just once.

There is already a simply process to purify clear water, called the solar ... "no question" if he was somewhere with no clean water. Pearce's paper, "Optimizing the Solar Water Disinfection ...