Experiencing "green" pond issues? If removing pond plants and using chemicals do not solve the problem, you should consider using ultraviolet clarifiers. UV clarifiers are comprised of UV tubes. A quartz jacket often separates the tube from the water. When water passes through this jacket, the tube emits UV light to damage and disrupt the cells of algae. This should often be enough to cause the algae to clump together and die. UV clarifiers usually work in tandem with pond filters. The latter is needed to remove larger clumps of algae. If you are looking to get ultraviolet clarifiers, look no further than Everything Koi.