Jecod UV Clarifier PU-36 work to keep your pond clean, clear, and free of green algae. These dependable clarifiers use ultraviolet light to destroy suspended green algae. As algae are pumped into the Clarifier they are exposed to Ultra-Violet light that destroys the reproductive ability of single-celled algae. The dead algae is then pumped out of the Clarifier where it clumps and is removed by your tank¡¯s filtration system. Jebao UV Clarifiers can typically remove heavy algae blooms within five-seven days and keep your pond algae-free long term.