— By Bradley Vanover — When epoxy pipe restoration makes (dollars and) sense. The first call to our national facilities maintenance group was an emergency. Sewage was backing up into the restroom of a major department store. Not good for business. Plumbers were called, quotes given, and shock ensued. Replacing old cast iron pipes is a pricey fix, but not a surprising one. Cast iron is notoriously subject to corrosion, particularly in waste lines where hydrogen sulfide gas forms. Drain cleaners, a common fix for slow-running pipes, often contain sulfuric …