Using this soap dispenser is easy. First, decide on your power source - you can use a battery pack with 4 AA alkaline batteries or an A/C adapter. Then, fill the 70.5oz soap tank from the top of the spout with liquid soap that has a viscosity between 100 cps and 5000 cps. When you place your hand under the spout, the touch-free dual sensors will detect it and dispense soap. The indicator light at the base of the spout will let you know if it's powered on, when it's activated, and when the soap is running low. As for maintenance, keep the dispenser clean by wiping it with a soft cloth. Check the anti-rotational gasket/washer regularly to make sure it's in good condition. Remember, this is a non-returnable item. Also, since it complies with ADA guidelines, it's suitable for a wide range of users.