Building a successful drain cleaning business without any advertising may sound about as plausible as an old clay pipe sewer line with no tree root intrusions. But that’s exactly how DrainPro in Baltimore grew from a small, one-truck outfit in 2011 to a company that now generates more than $1 million in annual gross revenue.
The formula for that growth was simple. Rather than paying big bucks to advertise its drain cleaning services to businesses and homeowners, the company instead opted to cultivate relationships with plumbers who avoid drain cleaning because of the labor and equipment expenses, explains Pat Martin, general
