A Danish product designer has created a recirculating shower system that uses the same water over and over again instead of letting it go down the drain. Unlike the standard shower, which uses around 10 liters of warm water a minute, this closed-loop system adds only 1 liter of warm water a minute during showering time. What’s more, the showering system filters the water each time it’s reused and retains the heat of the water very well, reducing utility bills while helping the environment.