EasyPro Eco-Clear Complete Pond FiltrationDirty pond water is moved through the pump to the pressurized filter. In the filter, the water is pushed through multiple densities of foam filters and cleaned of solid debris and then pushed through bio media for excellent biological filtration. The water is then exposed to high intensity UV lights that destroy algae cells, eliminating green water. Cleaned water is returned to your pond. The Eco Clear Complete Pond Filtration System includes: EC2600U