The Eazypod Air from Evolution Aqua is a very clever solution to dirty ponds. The dirty water enters the filter from a submersible pump and is drawn to the centre of the unit. As the dirty water makes this journey it passes through special K1 filter media which collects the dirt. To clean simply flick the air pump on and the central filtration unit bubbles up and cleans all of the dirt to waste. This set includes the Eazypod and a 70 litres per minute air pump. THE NEWER MODELS DO NOT HAVE THE INPUT SLIDE VALVE AS SHOWN IN THE IMAGE PLEASE NOTE THIS FILTER DOES NOT HAVE A UVC