The aerator adds air into the streams of water from the tap. Using an aerator uses 6L of water per minute, compared to 15L without -saving money and water.
Some Smeg taps offer water saving cartridges which reduce water consumption by 50%, sufficient for cooking and cleaning activities.
Smeg taps with energy saving cartridges only dispense cold water when depressing centrally. To obtain hot water simply turn the lever further left.