| 摘要 |
An improved system for filtering liquids containing particles in suspension, comprising a valve system for distributing liquid, a filter and a settling tank, in which the particles suspended in the liquid can settle during various phases at decreasing rates of settling, characterised in that a device are provided for emptying the top part of the settling tank and accompanying the liquid descending in the tank, the operation of the device being delayed for at least a part of the time corresponding to the phase of maximum speed of sedimentation.
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