The Berkey Light, like all other Berkey water purification systems, requires minimal maintenance. It primarily involves occasional cleaning: we suggest washing the lower chamber once a month with soapy water (dishwashing liquid). In areas with hard water, lime deposits may accumulate on various parts of the system after prolonged use. To remove them, soak the affected parts in vinegar or a 50-50% mixture of vinegar and water for about 15 minutes. Finish by cleaning with soapy dishwater, then rinse. After prolonged use, the flow rate of your system may decrease. To remedy this, simply scrub the outside of each Black Berkey purification element with a stiff brush or ScotchBrite pad and reprime the elements*. Additionally, we recommend keeping the Berkey Light out of direct sunlight. (*): original documentation in English, provided in French at the time of purchase or upon request.