Fuente: WIPO "tomato" The present invention relates to a cleaning system (10) for cleaning a filling machine configured to fill packages with a liquid food product. The cleaning system comprises a cleaning module (100), a foam supply module (200), a water supply module (300) and a water pump (400). The water pump is configured to pressurize the water supplied to the cleaning module or to the foam supply module from the water supply module. The cleaning system further comprises a control unit (500) configured to control an operational state of the water pump based on a reading from a water flow meter (310) in the water supply module or on a reading from an air flow meter (230) of the foam supply module.