The amazing ADA glass lilly pipe 

The subtle vortex that the ADA lilly pipe creates incorporates any floating debries into the body of the water where they are removed by the filter. Clean surface achieved in a very elegant way!
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The vortex and the almost invisible ADA lilly pipe.
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The vortex from above. Beautiful!
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Barely visible!
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How the ADA lilly pipe and the filter intake attach to the outside of the tank.
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Raising the lilly pipe a little creates a big aeration activity. The conical shape of the pipe creates a venturi. The water flowing through the pipe actually sucks the surrounding water. Any debries that may be present flow into the cone and then down into the tank where they are sucked by the filter.
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The water flows out of the lilly pipe in a special way - pointing down and spreading on the bottom part of the cone. If the cone was under water there would be flow in the opposite direction - the top part of the pipe (which is now empty) would have water moving toward the inside. After that the water would be expelled forward.
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