PROBLEM TO BE SOLVED: To provide a filter for water bath which easily allows a back washing.SOLUTION: The present invention relates to a filter for a water bath in which water W flows by a circulation pump 2. The filter for water bath includes a flow switching means having an inflow port 42 and an outflow port. The flow switching means includes: a circulation state in which the water W flowing from the inflow port 42 into the water bath A flows into one end side of the filter casing 1, flows through a filter medium 15 from one end side to the other end side, flows back to the flow switching means, and flows out of the outflow port to return into the water bath A and a back washing state in which the water W flowing from the inflow port 42 into the water bath A flows into the other end side of the filter casing 1, flows through a filter medium 15 from the other end side to the one end side, flows back to the flow switching means, and flows out of the outflow port.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】逆洗を簡単に行える水槽用フィルターを提供する。【解決手段】本発明は循環ポンプ2によって水Wを循環させる水槽用フィルターを対象とする。本水槽用フィルターは、流入口42および流出口を有する流路切替手段を備える。流路切替手段は、流入口42から流入した水槽A内の水Wをフィルターケーシング1の一端側に流入させて濾過材15の一端側から他端側に通過させ、その水Wを流路切替手段に戻して流出口から流出させて水槽A内に戻す循環状態と、流入口42から流入した水槽A内の水Wをフィルターケーシング1の他端側に流入させて濾過材15の他端側から一端側に通過させ、その水Wを流路切替手段に戻して流出口から流出させる逆洗状態との間で切替操作可能に構成されている。【選択図】図2
