How to stop slug buildup in all drains in house?

Our house has a concrete floor. It has one main drain pipe in the center of the house that everything drains through. Kitchen, washer, bath room stool, sink and shower. We have a constant problem with slug build up. We have had it cleaned out but it just comes back. Is there any product that we can purchase to put down the drains to help keep them cleaned out?

Frank Hornaday
January 2007