Hozelock Vorton 18 UVC Lamp\nThe Vorton offers optimum UVC power for pond sizes up to 6000 litres with fish, 12000 litres without fish. Higher powered UVC bulbs help maximise the elimination of algae and green water, improving the clarity of your pond.\n\nWhat causes greenwater?\nIn certain conditions, large quantities of microscopic algae grow in the water. They create the green water that spoils the appearance of a pond by making it impossible to see plants and fish. It\u2019s important not to confuse green water with the long strands of blanket weed that are also very common. Green water algae are so tiny that ordinary filters cannot trap them.\n\nAbout this item\nHigh-performance UV Clarifier lights help to, the algae stronger available\noffers the optimum UV Clarifier-thickness for recommended pond size\nCan be positioned in almost any position to complement your pond\u2019s needs\nCan by fixed to the pond wall or left free standing\nComes with 5 metres of cable, is easy to instr