Abstract: A supply system for supplying liquid, such as water, from a lower level to a higher level wherein a supply pipe has one end at the lower level and another end connected to a closed container substantially full of water, in use. A pump is immersed in the water in the container with an inlet to draw water from the container and pump it through a supply pipe to supply water to the higher level whereby, in use, the container substantially fills with water which is drawn into the pump and then out through the outlet. Pump apparatus is also described.