The Vorton offers optimum UVC power for pond sizes up to 4000 litres with fish, 8000 litres without fish. Higher powered UVC bulbs help maximise the elimination of algae and green water, improving the clarity of your pond. 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 11 MAX POND SIZE WITHOUT FISH IN LITRES (GALLONS) - 8000 (1760) MAX POND SIZE WITH FISH IN LITRES (GALLONS) - 4000 (880) RECOMMENDED FLOW RATE (GALLONS) - 2000 (440) UV WATTAGE - 11w HOSE DIAMETER - 25 - 40mm