Using this soap dispenser is easy. First, open the plastic battery box and insert 4-AA batteries. Then, fill the reusable plastic reservoir with 27oz of liquid foam soap. Mount it on the wall following the ADA installation requirements. When your hand gets within 2 - 3 inches of the dispenser, the infrared sensor will activate and dispense soap. As for maintenance, keep the stainless steel tank body clean by wiping it with a soft cloth regularly. Replace the batteries when the dispenser's performance starts to decline. Also, make sure to refill the soap reservoir in time to ensure continuous use.