Lotus Green Genie 2500 filter & 7w 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: 1500 lph. Suitable for ponds up to 2500 litres, depending on pond location and stocking levels. Max flow rate: 1750 lph Outlet size: 32mm. Inlet size: 19-25mm. UV bulb: 7 watt. Simple installation and low power consumption.