Preheat oven to 250 degrees. Grease/butter the bottom of a large baking sheet with sides.
In a mixing bowl, beat together the egg white and water until frothy. In a separate bowl, mix together sugar, salt, and cinnamon.
Add the pecans to the egg white mixture. Using a spatula, fold and stir the pecans until completely coated. Add the pecans to the sugar mixture, folding and stirring the pecans until completely coated. When the pecans are properly coated, there will be no sugar mixture left in the bowl. Spread the sugar coated pecans out on the buttered baking sheet, in a single layer.
Bake for 1 hour, stirring every 15 minutes. Let them cool completely before storing in an airtight container at room temperature. These will last several weeks, if they aren’t eaten before that!