keep it clean. One of the most important things, according to Roth, is making sure all your equipment is sanitized frequently. It's an early mistake he made when brewing at home. "With that first batch," he says, "not knowing too much about home brewing, it got infected." He recommends using Star San sanitizer, especially after boiling and before fermenting. "Since then I haven't had any issues with it," he says. "Just use sanitizer and rinse with boiling water on everything."