The UVC Active devices ensure clear water in your garden pond by reducing germs responsible for unwanted algae growth through ultraviolet radiation. The effect of the rays on microorganisms is based on photomechanical reactions in the cell nucleus. Only microorganisms exposed to UVC radiation lose their ability to divide and can no longer reproduce. The radiation is not harmful to fish and plants. With the help of the UVC Active devices, your pond water will quickly become clear again.