Those kids need educating!! Taps are not on/off devices, they have flow control built in. To fill a glass with water, turn them all the way on. To trickle water over your fingers to wet them before applying soap, just turn them on a small amount.
As with your bath, if it takes double the time to fill the kettle (sink for washing up, pan for boiling veg. or whatever) your pump is running for twice as long........ it's more efficient to have full flow taps and responsible users!



