Recycling and filtering water from sinks, showers, and washing machines can provide a typical household with fifty to one hundred (depending on the size of the house and daily use) gallons of water for outdoor irrigation systems and toilet flushing, significantly lowering water consumption. Similarly, rainwater collection systems (depending on the region) can supply a typical household’s entire water needs, including their potable water. Though not necessarily a new idea, rainwater collection design and technology have evolved lightyears recently, as proven by 2006′s winner of The Metropolis Magazine’s Next Generation Competition, the Hydro Wall, a concrete and thermoplastic wall system that combines rainwater catchment, storage, filtering and recycling to supply buildings with an efficient and renewable water supply.