We recommend keeping the Berkey Light™ out of direct sunlight to prevent growth of algae. The only other maintenance we suggest is to wash the lower chamber once per month with soapy dishwater. In areas with hard water, calcium scale may build up on spigot and chambers after prolonged use. To remove, soak affected part(s) in vinegar or a 50-50% mix of vinegar and water for about 15 minutes. Finish by cleaning with soapy dishwater. After prolonged use, the flow rate of your system may decrease significantly. To speed up flow rate, simply scrub exterior of each purification element with a stiff brush or ScotchBrite® pad and re-prime elements.