Patent ID: 8186518

Claim:
A water purification unit comprising: a fluid inlet adapted to be in fluid communication with a water source; a fluid pump in fluid communication with the fluid inlet, the fluid pump adapted to draw water from the water source to the water purification unit; a main filter in fluid communication with the fluid inlet and the fluid pump, the main filter comprising a series of filters adapted to filtrate the water from the water source; an expansion tank in fluid communication with the fluid inlet, the fluid pump, and the main filter; a water purification unit outlet in fluid communication with the fluid inlet, the fluid pump, and the main filter, the water purification unit outlet adapted to provide filtered water; a controller, the controller electrically coupled to the fluid pump; a pressure sensor that senses the pressure of the expansion tank and transmits a pressure signal to the controller; a power system to provide electrical energy to the water purification unit; the power system comprising: a non-grid power source electrically coupled to the controller and the fluid pump; and a cylindrical housing defining an interior space to house the fluid pump, the main filter, and the controller; wherein the fluid pump cycles on when the pressure in the expansion tank decreases below a first threshold and cycles off when the pressure in the expansion tank increases above a second threshold.