Heat 6 cups water and sugar in large kettle. Mix Therm-Flo (available at bulk food stores) with 2 cups water. Add mixture to hot water, stirring quickly. Cook until clear, about 5 minutes. Add corn syrup and gelatins. Cool and add sliced or diced peaches. Put in freezer containers, label and freeze.
To use: Thaw filling in refrigerator. Pour into baked pie shell. Top with whipped topping.