Pure De-ionised water. Used to prevent furring and scale formation.
For use commonly in steam irons and re-fillable batteries. Also used in window cleaning and due to containing no minerals it will not leave streaks or deposits when dry.
Additionally polished and then filtered with a UV lamp the micro-siemen count is typically 5 and always less than 10. (or approximately 10ppm).
Protect from daylight for storage.
Distilled water has the same properties but it is derived by steam distillation.
