The abundance of isotopes is different in different regions and at different times. If you are interested, you can check the composition of SMOW and the isotopic distribution in the Yangtze River basin. The stable isotopes of hydrogen are deuterium and deuterium, which have distillation effect in nature. After each distillation, the deuterium concentration in the gas phase will decrease, and the accumulation of repeated distillation will lead to a low deuterium concentration in the polar regions of glaciers and a high deuterium concentration in the equatorial regions. The deuterium concentration in natural water is about 150ppm, which is actually composed of semi-heavy water HDO, not "one thousandth of heavy water". This video is really not very rigorous. The distribution of isotopes on the earth is consistent, otherwise the relative atomic mass is useless. There should be no low deuterium water. Only nuclear-grade raw materials can separate isotopes, and the cost is not low. Just think about how expensive heavy water is. The water we usually drink is one thousandth of that of heavy water, not nothing. This kind of propaganda should be problematic.