The technology is based on high temperature thermal water dissociation.
At elevated temperatures water molecules split into their atomic components, hydrogen and oxygen. For example, at 2200°C almost five percent of all H2O molecules are split into their components.
At that moment the two gases are extracted separately, in amounts equivalent to their occurrence in the water molecule, i.e. in the ratio of two to one.
The extracted hydrogen is pure. The process does not produce any pollutants or waste.