Simple, Low-Cost Clay & Sawdust Disk Purifies Water

This water filter—mostly made of local clay, sawdust, and water—can easily be made in the local communities that need access to low-cost water purification. The materials are pressed in a mold, fired in a kiln, and coated with silver or copper nanoparticles that can disinfect drinking water. The company makes both a tablet-size filter, and one shaped like a bowl to aid in collecting water.