During the early 1970s people were attempting to design small indoor hydroponic units, but with little knowledge of the general public of what hydro-ponic growing was all about, most of these business ventures into marketing of small indoor units were not successful� It took almost a decade for consumers to become more aware of hydroponics and its potential for indoor growing� Companies estab-lished at this later period in marketing such small indoor units did become very successful, and, in fact, many of them still exist today� Now they manufacture and sell all components from lights, carbon dioxide generators, nutrients, and so on, in addition to the hydroponic growing units themselves� Some of these companies now have world-wide distributors of their products�
