My idea is to make a garden tool that looks exactly like a lawn roller, with numerous spikes protruding from the roller to gather the leaves. This equipment would have a horizontal flat bar fixed across the roller frame to knock off the leaves {as the roller turned} into a collecting box or basket, which would also be secured to the framework. The basket should be easily removable to deposit the leaves in the usual place . All parts would be manufactured from plastic materials [pliable or...

I use a pressure water jet to clean concrete garden slabs. For reference, I used 80 gallons of water and the project took six hours. I cannot imagine how much electricity was used. I believe that technology exists to manufacture a sonic cleaner similar to a portable metal detector. If this could be achieved, then world wide savings in water, electricity, and labor hours could be very significant.