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This video shows the Vortex TORNADO 4 inch dredge working moving Magnetite (black iron sand). The suction value is 97kpa (the highest of any 4 inch Venturi that we know of). The diver is using a 12 meter long inlet hose. The Vortex Venturi has been tested in a test tank against a well known competitors Venturi and found to be 38% more powerful than the competitor - whilst the Vortex uses less energy input. Removal rates are calculated at around 60 t/hr plus, 27 cu mtr/hr plus and 15% solids by volume plus using this medium. See our website for more details on our product range and contact us if you require a custom built dredge. www.vortexdredge.com