Pondmax PF Pressure Filters with inbuilt UV Clarifier are designed for use on any pond or aquaponic system. Multi stage cleaning with dual action biosponges. Great user friendly design with low maintenance backwash rinsing system - simply turn switch to backwash mode and turn handle to clean sponges. Built in cleaning and UV indicators. Can be used in-line for waterfalls and water features. Unit is designed for placement external to the pond system, not for submersion. Unit can be buried in the ground to just below the lid, beside your pond. Recommended flow and pond sizes below are based on typical ponds with average sun exposure and fish stock in the Perth region. Heavily stocked ponds in full sun positions may require greater filtration. 2 year warranty. Cable Length 5m.