The idea is that their electrolysis unit is fed by the generator, which is in turn fed by the hydrogen from the electrolysis unit. To make the contraption somew

The idea is that their electrolysis unit is fed by the generator, which is in turn fed by the hydrogen from the electrolysis unit. To make the contraption somewhat more scientific-looking (and less suspect), they've put two water filters in the loop, presumably to 'purify' the hydrogen.