Water Ice 101: Your guide to Philadelphia's favorite frozen treat

What is water ice? Why do Philadelphian's love it? How do you pronounce it? Those questions, answered. We talked to John Italiano of old school Pop’s Homemade Italian Ice (since 1932!) and Kirk Hightower and Brittany Tolliferreo of the new Kylie and Milan’s Tropical Treats to find out all about the favorite Philadelphia summer treat. (Video by Julia Hatmaker/PennLive)