Letter: Sodium content of water-softened water.
D010783:Photometry; D012964:Sodium / Q000032:analysis*; D012965:Sodium Chloride; D014867:Water / Q000032:analysis*; D014880:Water Softening / Q000592:standards*; D014881:Water Supply
D014867:Water; D012965:Sodium Chloride; D012964:Sodium