PROBLEM TO BE SOLVED: To provide a device for rationally replacing flower water (electrolytically-generated acid water) in each water tank in a flower showcase that employs the electrolytically-generated acid water as the flower water for cut flowers, especially for properly replacing the flower water in each tank without consuming the electrolytically-generated acid water wastefully.SOLUTION: In the flower showcase for displaying cut flowers, a plurality of water tanks 20 for holding flower water for cut flowers are arranged in a plurality of steps like a stair. An electrolyzed water generator 40 serving as a source of flower water is operated for electrolysis, and the electrolytically-generated acid water generated is supplied into the water tanks 20 on the upper step as flower water. As the flower water supplied into each of the water tanks 20 on the upper step is held at a certain level, the water tanks 20 on the next and lower step are caused to overflow, to supply the flower water into the water tanks 20 on the lower stage.COPYRIGHT: (C)2013,JPO&INPIT【課題】切り花用の活け水として電解生成酸性水を採用するフラワーショーケースにおいて、各水槽内の活け水(電解生成酸性水)の入替えを合理的に行う、特に、各水槽内の活け水の入替えを、電解生成酸性水を無駄に消費することなく的確に行う装置を提供する。【解決手段】切り花用の活け水を収容する水槽20を階段状に複数段備え、活け水の水源である電解水生成装置40を電解運転して、生成された電解生成酸性水を活け水として上段側の水槽20内に給水するとともに、上段側の水槽20内に給水された活け水を一定の水位に保持しつつ次段の下段側の水槽20内にオーバーフローさせて下段側の水槽20内に給水する切り花展示用フラワーショーケースとする。【選択図】図4