| 摘要 |
A filter sponge having a replace-indicating function is mainly used in an aquatic filter to filter aquatic breed water. The filter sponge includes a sponge body ( 10 ) centrally defining therein a vertical passage 11 . A replace-indicating mechanism ( 20 ) is located at a top side of the vertical passage. When the filter sponge is used to filter breed water, the replace-indicating mechanism indicates to the user the state of the filter sponge, by which the user can be aware of whether the filter sponge needs to be replaced.
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