Clear water for ponds up to 4,000 litres (880 gallons). This bestselling Ultra Violet Clarifying Unit offers the optimum UVC power for pond sizes up to 4000 litres. The higher 11w powered UVC bulb helps maximise the elimination of algae. The Vorton 11 comes with 5 metres of cable, is easy to install and maintain, and includes a 2-year warranty and a Clearwater guarantee. Specifications: Hozelock Part Number 1559, Model: Vorton 11, Max Pond Size without Fish in Litres (Gallons): 8000 (1700), Max Pond Size with Fish in Litres (Gallons): 4000 (880), Recommended Flow Rate in Litres (Gallons): 2000 (440), UV Wattage: 11w, Hose Diameter: 25 - 40mm.