The Optimatic is an automatic pump controller, which starts and stops the pump 'on demand'. When a valve or tap is opened on the outlet side of the control, the Optimatic senses the drop in pressure and instantly starts the pump. When the valve is closed the pump continues to run for a further 10 seconds to prevent water hammer, and then stops ready for the next demand for water. If the pump runs out of water during operation, the Optimatic will automatically shut down the pump to prevent damage. Once the water supply is restored, the Optimatic then automatically re-starts the pump.