The Green Genie 12500 is a popular pond filter that has been around for many years. As of 2017 it has had a face-lift which includes an enhanced UV output from 16 watts to 18 watts. This is a \'flow-through\' filter which means that the pond must be lower than the filter outlet. As this outlet is positioned high up on the filter box it can be partially buried if necessary. Note: Colour of box filter changing from green to black over the course of 2019. NOTE: UVC bulb included.