Rain Barrel and Water tank installations for Your home, garden or office. Bay Area based Rainsavers gives the homeowner many choices of barrels, water tanks, bases and accessories. Rainsavers has developed a complete system starting with a review of your downspouts, best locations for barrels, and simple treatment of rain water. Rainwater harvesting appears to be one of the most promising alternatives for supplying freshwater in the face of increasing water scarcity and escalating demand.