
Lily Impeller: A Nature-Based Design
Lily Impeller, which was originally designed as a propeller for boats by Jay Harman, has been used as a device to mix water in water tanks around the world. It is reported that one such device, about 6 inches tall, is able to circulate hundreds of millions of gallons of water. The device only consumes as much energy as it takes to light a bulb, but it can save 85 percent of chemicals due to its ability to move the stagnating water.