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The water flows out 80% bottom drain and 18% top skimmer. It than is collected into a large cylinder 2 feet below the pond surface. From there it drains into two streams that travel down grade about 150 yards winding around landscape percolating back into the ground .
The added water is pumped from a 35 foot well directly into pond with no preparation . I always kept surface glassed in order to see and feed koi easier. Now it looks a bit turbulant but koi are having a blast swimming into rapids.
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