Arrived in 10 days after order, well packaged. I have no idea about the amount of hydrogen if this is generated, but with certitude a consistent quantity of ozone is produced and released into the water, the smell after the process when you open the lid it is unmistakable. . Well, the ozone disinfection for tap water is the most expensive, clean and efficient method. I must test moire, maybe with some microorganisms infected water watched under microscope after the process, normally the ozone must kill them and break any organic matter in water, co2 and inorganic compounds.