Waterpebble
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Pop the Waterpebble in your shower and it will help you save water and energy by keeping an eye on how long you spend in the shower.
The device memorises the first shower you take with it and uses that as a benchmark. For future showers, it monitors the water going down the plughole and flashes lights from green through to red to let you know when it's time to get out of the shower. It will even fractionally reduce your shower time every time to help you save even more water without thinking about it.
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