I forgot to add salt to the Yikou water softener. According to the functional settings of the Yikou water softener, it can be seen that the working principle of the Yikou water softener is that salt is used to restore the ability of the resin to replace calcium and magnesium ions. If you forget to add salt, outofsalt will be displayed, so the Yikou water softener forgot to add salt. Yikou is a manufacturer of water treatment products. In 1925, Yikou Water Purification was born in the United States. It invented and patented a household automatic water softener. It is headquartered in St. Paul, the capital of Minnesota, USA. It already has 11 global production bases and sales companies. 4 R&D centers.