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；
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.
当沉积池排水不畅时，清理并替换砂砾；
Sedimentation tank shall be cleaned or sand therein shall be replaced in case of drainage difficulty.
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