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What filters required for a pond or small pond?

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The best water filter is the earth. Even better, clay. The best stone. So road wells. The deeper the well the purer the water. In artificial reservoirs, made of a material in the cement, with the subsequent framing are not passing water with the material, pour the already filtered water. Dug in the ground waters usually water cleans itself with moss. It completely covers the pond, and on top of anything in the water. However, to get clean water, it is necessary to push the duckweed. It is quite difficult. Moreover, frequent intake of water begins to stir up the bottom silt the water. These exceptionally clean waters in nature are lakes. Especially such as Baikal. Other shallow bodies of water are relatively clean.
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