There are certain models which have a sixth stage to remineralize the water and balance the pH. Also relying on municipal water for mineralization is a bad arg

There are certain models which have a sixth stage to remineralize the water and balance the pH. Also relying on municipal water for mineralization is a bad argument. The minerals in water supplies is highly localized, or drinking tap water could leave you deficient in one or more minerals depending just depending on where you live.