Purified water has been processed through a water treatment facility. It contains chemical purifiers and softeners which leave a drying residue on the skin. Well water , even when filtered, is unpredictable and usually alkaline. It is always advisable to have well water tested for pollutants and bacteria. Just because a water is within safe limits of pollution and bacteria for drinking does not mean the water is beneficial for skin.
Formulated water includes any water with added chemicals and ingredients.
The category includes swimming pool water contains chemical purifiers and has a chemically induced pH balance. Swimming pool water is not natural and is drying and irritating to skin and eyes. Scented or flavored water . Scented spray waters and flavored waters are formulated waters which contain additives. After the water evaporates, the additive leaves a residue which is drying to skin.