To provide a water treatment apparatus including a two-stage RO module and capable of increasing the recovery rate of the entire apparatus. The present invention relates to a front-stage discharge path that extends from a front-stage RO module and discharges a part of the front-stage RO drainage, and is branched from the front-stage discharge path and joins the upstream side of the front-stage RO pump. A pre-stage circulation path capable of joining the other part with soft water as the pre-stage circulation water, and a further branch from the pre-stage discharge path or the post-stage circulation path to join the soft water tank, and another part of the pre-stage RO drainage is pre-stage And a pre-stage return path capable of joining the soft water in the soft water tank as return water. [Selection] Figure 1【課題】２段のＲＯモジュールを備え、装置全体の回収率を高めることができる水処理装置を提供すること。【解決手段】本発明は、前段ＲＯモジュールから延びて前段ＲＯ排水の一部を排出するための前段排出路と、前段排出路から分岐されて前段ＲＯポンプの上流側に合流し前段ＲＯ排水の他の一部を前段循環水として軟水に合流させることが可能な前段循環路と、前段排出路または後段循環路から更に分岐されて軟水タンクに合流し前段ＲＯ排水の更に他の一部を前段戻し水として軟水タンク内の軟水に合流させることが可能な前段戻し路と、を備えている。【選択図】図１
