Master plumber Ed Zeitler has learned an awful lot about plumbing and running a company during his 37 years in the trade. But the owner of Zeitler Plumbing, based in northeastern Wisconsin, says he’s learned one thing in particular that has carried his company through thick and thin: An educated customer is a loyal customer.That’s why Zeitler Plumbing technicians are required to always explain to customers the problem they encountered, what they did to fix it and, perhaps most important of all, how the customer can prevent it from happening again, says Zeitler, 57, a third-generation owner of the business,
