If you want to install a fountain, waterfall or stream, it is important that the pond water will become and remain crystal clear. Clear Control pressure filters can withstand high pressure and the water can bridge a difference in height after the filter. The Green Line pond pump has a large capacity at low energy consumption. The Clear Control pressure filters are also available as complete set for ponds up to 10,000, 20,000 or 30,000 litres of water.