A pump where you control the flow. From 9,300lph to 19,800lph.the variflow pumps threaten a revolution in the pond pumps market. With an energy efficient pump and a whole host of other features, the variflow range builds upon the design of other pondxpert pumps.variable flow rate with an eco design the weatherproof electronic controller allows you to increase or decrease the flow rate, allowing the pondxpert variflow 20000 to be run 'low' at winter, which reduces the wattage used. The lcd controller panel can also be used to stop start the filter pump.fault code description the lcd controller panel will detect any pump malfunctions and will display an error code.auto off feature the variflow pumps will turn off if they detect that the water levels have become too shallow for the pump to operate. This offers much needed pump protection!easy maintenance the variflow pumps handle solid particles up to 6mm, drastically reducing maintenance and blockages. dry running pump these pumps can be ran ‘dry’ if required.please note the pump should be positioned below pond water level if you are running the pump dry.