Product mistakenly used under the unfortunate impression that it will improve the environmental condition of the female nether-regions. In fact, the vagina is a self-cleaning organ and use of this product may hinder the "good bacteria" naturally present whose job it is to maintain a state of cleanliness. Should the vagina show signs of infection which would potentially lead to the mistaken impression that douching would be a good idea (unpleasant smell, etc.), one should seek professional medical treatment because they probably have some sort of an infection which can be cleared up properly with medication.
The use of douche, an unfortunately common practice, leads all too frequently to a disruption in the normal self-cleansing vaginal environment, resulting in repeated and worsening symptoms.