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I’m on holiday right now with family in North America and they have a natural pond. It’s about 125-150ft long, 100ft wide, and 12ft at the deepest. An oval shape dug out with a digger so it’s edges smoothly curve downwards. It’s stocked with around 20koi and goldfish which in recent years they are unable to see as its gone brown. Some reeds around the edges, also contains nests and frogs of some sort. Any ideas on cleaning up a huge pond like this? It does not have a liner or pump or anything, just a clay bottom.