One of the many things that has changed significantly over the years I have been involved with the industry has been the advent of products developed to replace use of rock or gravel as the distribution media. These are referred to as gravelless systems and come in a variety of forms, including open-bottomed chambers, fabric-wrapped pipes, expanded polystyrene peanuts and chips, and numerous other products.
Advantages of these types of systems include their relative ease of transportation and installation versus handling quantities of rock. In all cases, from an installation standpoint the same rules or principles for rock-filled trenches or beds
