At last an automatic electrically operated internal cleaning system in a large pond filter from Grech Sunsun, the biggest pond filter manufacturer in the world. This is a filter for big ponds up to 50,000 litres. Its the biggest canister filter Sunsun make. The CPF 50,000 measures 750mm high and is 500 in diametre This 55 watt UV filter has an automatic electrically operated self cleaning function which makes cleaning easy simple and clean , without having to disassemble the filter. The auto clean function squeezes the filter sponges inside the filter, cleaning them in the process, and by pass tap which means you don't have to take the filter apart to clean it. This filter will take variable sized hoses 25 ,32 mm and 50 mm. See my listings for hoses It is suitable for ponds up to 50,000 litres and has a suggested maximum out put of 50,000 litres per hour. I have the biggest range of pond filter and pond pumps in New Zealand from 1000 litres to 50, 000 litres Questions welcomed. Best price in New Zealand. Free freight, prompt delivery.