An excellent tip to save water is to harvest rain water with the RainReserve Kit and Rain Barrels. The eco friendly RainReserve Rain Diverter diverts rain water from your gutter downspout into rain barrels while automatically stops algae, stops mosquitoes, and stops critters from getting into your rain barrel and rain diverter. Rain water harvesting is one of the best saving water ideas that has been around for thousands of years.