Clear Jel is modified corn starch that can be used in high heat and/or high acid situations like making canned pie filling, or canned soups. It thickens as it cools so the heat can penetrate throughout the canning jar. It is the only thickening agent recommended by the USDA for canning.
Instant Clear Jel will thicken cold liquids. It lets you freeze or refrigerate fruit pies, or thicken fruit pie filling before putting it in a crust and then baking. It can only be heated once without breaking down. It needs to be mixed with sugar to help it distribute evenly.
Pie filling enhancer is is instant Clear Jel mixed with ascorbic acid and superfine sugar. It is about 50 percent sugar so you have to cut back on the amount of sugar called for in your recipe.