What is deuterium depleted water?

What we commonly refer to as water, consume every day, use to prepare foods and beverages, irrigate our lawns, wash our clothes and put out fires, is more complex in its composition than is indicated by the popular chemical formula “H2O”. Chemically speaking, natural water predominantly consists of three molecules: H2O, HDO and D2O, and if you consider all the isotopes of oxygen and the various configurations, there are really 63 different types of water molecules known, in approximately the following ratios.

Deuterium depleted water (DDW), also referred to as light water is a term given to a unique composition of water in which the natural deuterium content is at least 15% less than 155 ppm, which the the deuterium content of the ocean and the highest level present in the natural waters on Earth. In a 1 Liter bottle of regular water there is about 6 drops of heavy water a.k.a, HDO.