Lotus Green Genie 6500 filter & 18w UV Lotus Green Genie filters provide quality filtration for your pond. The internal UV treats algae in the water which lowers the risk of algae problems especially during the summer months. This product helps create clear pond water for happy and healthy fish. Specification Recommended pump size: 2500 - 3000 lph. Suitable for ponds up to 6500 litres, depending on pond location and stocking levels. Max flow rate: 2500 lph Outlet size: 32mm. Inlet size: 19-25mm. UV bulb: 18 watt. Simple installation and low power consumption.