The Aqua Ultraviolet Classic Series UV Clarifiers are ideal for ponds, aquariums, and water features. With one of the longest-lasting lamps on the market, you will replace bulbs less often, saving money. The high-quality quartz sleeve allows for a 99.9% transmission rate. The clear quartz cap makes it easy to see whether the UV bulb is on. As a clarifier, the Classic 114W works in ponds up to 9500 gallons.