A filter sand cleaning tank 30 for storing and cleaning the light filter sand 20, one end of the filter sand cleaning tank 30 is connected to the top of the upper cone part 12 of the sewage filter chamber 11 of the sewage filter tank 10 through a sand inlet pipe 31, the other end of the filter sand cleaning tank 30 is connected to the sewage filter chamber 11 of the sewage filter tank 10 through a sand outlet pipe 32, so that it can be used for circulating cleaning the light filter sand 20, The light filter sand 20 can be stored in the filter sand cleaning tank 30.<br>
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