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The Zickert Z200 bottom sludge sweeper is based on the forward and backward movement of the profiles in a hydrodynamic way. The concave side of the profile pushes the sediment into the sludge hopper, while on the return movement the conical part fits under the sludge layer.

The shape of the profile is the result of extensive research. Experiments in test ponds have shown that the concave shape is the optimal solution for various types of sludge, different scraping speeds and the best possible thickening effect.