Using this automatic soap dispenser is easy. First, install the 4 alkaline 'D' cell batteries into the dispenser. Then, insert the 800ml foam soap refill. When you place your hand under the dispenser, it will automatically dispense foam soap. As for maintenance, make sure to replace the batteries when the dispenser starts to work slowly. Also, refill the soap when it runs out. Keep the dispenser clean by wiping it with a damp cloth regularly. Avoid getting water inside the battery compartment to prevent damage.