By simply twisting a knob on this filter it automatically cleans itself! In the 'run' position the water undergoes a 4 stage purification process. Simply turn the knob to Clean and the foams are squeezed by up to 1000lb of water pressure forcing out pond sludge. The back flushed dirty water is then pushed out through the second waste outlet typically down the drain or flowerbeds. This unit boasts a built in 13w UVC and guarantees clear water for ponds up to 15,000 litres or 3000 gallons. Figures based on pond in full shade with waterplants 7500 litres for ponds in full sun.
