WaterPebble-Tracks The Water You Use
Here’s an interesting concept by Paul Priestman.
It has 3 different shades of lights: green, red and yellow. You can pretty much guess which colors mean what. Red means you need to get your tail out of the shower, yellow means you should speed things up a bit (tell this to your wife 🙂 ) and green means you’re in the clear. It sits right next to your drain and just keeps track of how much water goes down it.
It’s an interesting concept and maybe it can be helpful on letting too much water go down the drain.