One of the best things about using hydrogen as a fuel alternative is that the only by-product is water vapor. Throw in that the supply is almost limitless, because it is an element that is generally available anywhere and  much evenly distributed around the planet

Hydrogen
This fuel is complete in itself. It does not need oxygen from the atmosphere to burn, which is an improvement over fossil fuels in saving the oxygen in our air supply. In fact, when hydrogen burns perfectly, nothing at all comes out of the tail pipe. If salt and metal alloy are used to create hydrogen, then there will be residues of that in the exhaust, but hydrogen fuel does not contribute oxygen to the atmosphere

How can we produce Hydrogen
Hydrogen in its purest form from water through electrolysis. In order to obtain hydrogen from water you will use a process called electrolysis, which is the separation of water into its basic 1 oxygen atom and 2 hydrogen atoms. Sending an electrical current through the water does this, but since energy cannot be created or destroyed, only altered, the atoms or molecules are simply rearranged into a different state that is the HHO gas, a very efficient and stable burning gas. This electrolysis process does not require a great deal of electricity so it can come from your battery or alternator without causing any problems.

This type of conversion also addresses another issue of safety; it helps in producing hydrogen on demand only when it is needed, not as a constant. This also means that there are fewer pollutants making it ecco- friendly.
The hydrogen gas traveled to a main tube, and from there straight to the carburetor.

Saltwater converter project kit is available for Engineering /Diploma students