Washing failure determination method and washing failure determination program for fresh water generator

In a method for washing a separation membrane module after membrane filtration, in a variety of washing steps such as back pressure washing, air washing, and chemical washing, after the completion of membrane filtration, for each washing failure, the change over time of the impedance increase speed is calculated on the basis of the increase in membrane pressure difference, and the washing failure is determined. 提供造水装置的运行方法和判定程序，在膜过滤后洗涤分离膜模块的方法中，在膜过滤结束后，实施反压洗涤、空气洗涤、药液洗涤等各种各样的洗涤步骤中，对各洗涤故障，基于膜压差上升算出阻抗上升速度的随时间变化，判定洗涤故障。