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The drainage methods of filter presses are generally divided into open flow, dark flow, and light and dark flow. Open flow refers to the way in which the filtrate is directly discharged from the side of the filter plate, while dark flow refers to the way in which the filtrate is collected into a channel composed of multiple filter plate corner holes and uniformly discharged.

Chiyuan provides the technology transformation of the pressure filter from dark flow to open flow and from open flow to dark flow.