Firstly, it seems likely that your home tap water may be somewhat acidic. Furthermore, if the tap water is rich in carbonate content, it may be difficult for the apparatus to produce normal alkaline ionized water. We suggest boiling the generated water once in order to volatilize the carbonates. After letting it cool, measure the pH. If the pH indicates alkalinity, it means regular electrolysis was performed by the apparatus. Please adjust the electrolysis capability according to the instruction manual for the product, or contact the customer service department of the manufacturer.