The MESH plate upgrade replaces the standard flat plates, which allow the water to flow in and out of the MESH plates - providing longer contact with the water in the ionization chamber. MESH plates have many more edges than flat plates allowing electricity to transfer more efficiently from the edges of the MESH plates in to the water - creating a more beneficial and potent ionized water. So what does all this mean in terms of a water ionizer? This upgrade significantly increases the anti-oxidant power by ten to fifteen percent over standard flat plates. Anti-oxidants neutralize dangerous free radicals that damage cell DNA, which can lead to accelerated aging. If you want the strongest anti-oxidant power, then MESH plates are the upgrade for you.