Sedimentary soil shall be cleared when reaching 50% of the capacity. Sedimentation tank shall be cleaned or sand therein shall be replaced in case of drainage difficulty.

当沉积土达容量的50％时，清理沉积泥土；当沉淀池排水不畅时，清理或替换砂砾；

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Sedimentary soil shall be cleared when reaching 50% of the capacity. Sedimentation tank shall be cleaned or sand therein shall be replaced in case of drainage difficulty.

当沉积土达容量的50％时，清理沉积泥土；当沉淀池排水不畅时，清理或替换砂砾；

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