#What-isHydrogen-water? This version of hydrogen water is called direct in the original Japanese language. Since the Japanese word for hydrogen means hydrogen, hydrogen-rich water is defined as hydrogen water with a hydrogen content (meaning H2 gas dissolves in water) of more than 800 parts per billion (ppb) in water. In Japanese culture, hydrogen water is defined as a water with a hydrogen content greater than 800 parts per billion. #hydrogen_water_bottle #hydrogen_water_generator #hydrogen_water_bottle_generator #hydrogen_water_machine #hydrogen_rich_water #hydrogen_water_benefits