Using a vegetable peeler or metal cheese slicer, cut potatoes into very thin slices. Place in a large bowl; add ice water and salt. Soak for 30 minutes., Drain potatoes; place on paper towels and pat dry. In a small bowl, combine the garlic powder, celery salt and pepper; set aside. , In a cast-iron or other heavy skillet, heat 1-1/2 in. oil to 375°. Fry potatoes in batches until golden brown, 3-4 minutes, stirring frequently. , Remove with a slotted spoon; drain on paper towels. Immediately sprinkle with seasoning mixture. Store in an airtight container.