Get crystal clear pond water and a healthy environment for fish and aquatic plants with our special built-in UV-C units for the Clear Control pressure filter, Cross-Flow Biofill and Giant Biofill XL.These units work by ultraviolet radiation that attacks and kills the cells of green floating algae and pathogens. With the supplied ‘Long Life’ UV-C lamps, which have a lifespan of approx. 7000 burning hours, you can be sure that all floating algae and possible pathogens are killed before the water is passed through the filter material.With our built-in UV-C units, you can achieve crystal-clear pond water and a healthy environment for fish and aquatic plants in a short space of time – whether for koi or swimming ponds. Use our built-in UV-C units for optimum pond water and a healthy environment for your fish and aquatic plants.