The product is a water purification panel which filters and sterilizes pathogen contaminated water with sunlight. It is a robust, gravity-fed filter, it does not require electricity, nor chemical agents to provide the sterilization effect. Lab-scale prototype testing experiments forecasted that a 1 m2 panel (in zero power mode!) could filter 10 liters of drinking water within 5 hours. This quantity is equal to the average daily water intake of a family (composed 4 persons).