Hozelock Vorton 55 UVC Lamp The Vorton offers optimum UVC power for pond sizes up to 18500 litres with fish, 37000 litres without fish. Higher powered UVC bulbs help maximise the elimination of algae and green water, improving the clarity of your pond. What causes greenwater? In 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's 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. About this item High-performance UV Clarifier lights help to, the algae stronger available offers the optimum UV Clarifier-thickness for recommended pond size Can be positioned in almost any position to complement your pond's needs Can by fixed to the pond wall or left free standing Comes with 5 metres of cable, is easy to install and maintain How do UVCs work? As the pond water passes the UV lamp, the light makes the algae clump together so they are caught in the filter foam or sink to the bottom of the pond. You should see an improvement in days and achieve complete clarity in 6 to 8 weeks. A separate UVC can be connected into the hose run between the pump and filter. Why are Hozelock Cyprio UVCs so effective? Water is slowed down as it passes the lamp to increase UV penetration Quartz glass tube covering the UV lamp permits effective penetration of UV rays. Ordinary glass cuts this by 90% UV lamp runs at optimum operating temperature in an enclosed chamber Water is kept as close as possible to the UV lamp to maximise the UV efficiency Single ended lamps last longer and have higher UV output Specifications MODEL - Vorton 55 MAX POND SIZE WITHOUT FISH IN LITRES (GALLONS) - 37000 (8140) MAX POND SIZE WITH FISH IN LITRES (GALLONS) - 18500 (4070) RECOMMENDED FLOW RATE (GALLONS) - 9250 (2035) UV WATTAGE - 55