Why do you need a UV clarifier? These products are designed to destroy ultra-fine particles that causes discoloration in your water garden, koi pond, and other water features. Combined with full sun exposure, UV Clarifiers are a great addition to any healthy pond. At Everything Koi, we carry the latest range of Evolution Aqua UV clarifiers. You can enjoy complete peace of mind that these products are of the highest quality as they are manufactured by the award-winning company, Evolution Aqua. They are built to last.