WaterPebble Trains You to Use Less Water When You Shower

What the WaterPebble does is monitor the amount of water that’s going down the drain. It takes note of the amount of water you used when you first showered with it and uses this as the benchmark for the rest of your showers – so make sure you shower just right the first time you use it.

For your subsequent showers, the WaterPebble will then flash from green to yellow to red like a traffic light to signal when it’s time for you to wrap your bath up. It will fractionally reduce your shower with each use, so you will slowly work your way to using less water each time.

You can get the Water Pebble from Uncommon Goods for $10(USD),

http://technabob.com/blog/2012/02/28/waterpebble-water-conservation-gadget/