A Design For Poverty
Water harvesting consists of three main components: a catchment area (generally a roof), a gutter system and a water storage area. The water storage area is by far the most expensive portion of this system, which makes it out of reach for many families. The RainDrops system simply allows people to adapt standard plastic bottles to an existing gutter system to collect rain water. This changes water storage from the most to the least expensive part of the system.
These are much easier to clean and replace than larger storage units. The repurposing of these plastic bottles will also give value to many bottles that are otherwise headed for landfills. The RainDrops system includes an attachment that allows people to create running water to wash their hands. Another large benefit to using plastic bottles as a water collection system is that it fits in nicely with the process called SODIS, which uses a combination of the suns UV rays and heat to remove pathogenic microorganisms that cause disease.
Via : Yankodesign