While seltzer water and sparkling water are both carbonated waters, there is a slight difference. Seltzer water has added minerals such as sodium bicarbonate and potassium sulfate, while sparkling water does not. Seltzer water also typically has a slightly different taste than regular sparkling water because of the minerals added in. Soda Water is different than both sparkling water and seltzer water, as it contains sodium bicarbonate. This gives it a slightly more acidic flavor than the other two types of waters.