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Somehow, the idea of daily showering in already used water doesn't have huge appeal, but the idea of an eco-friendly shower that re-circulates and cleans used water is, I admit, quite clever. If we can get past the idea of "dirty water,"

UK design student Peter Brewin's shower concept is said to be able to save the city of London 85 billion liters of water a day using technology based on a Dyson vacuum cleaner to clean and reheat the recycled water and then heat it to the proper temperature.

Eco-aware shower recycles water [BBC News]