Introduction to DEL Industries Founded in 1975, DEL Industries has been manufacturing products for the swimming pool and water industry for over twenty years. DEL began to include ozone generators to its product line in 1981. The demand for DEL's ozone systems became so great that by 1984 all other products were abandoned for a complete line of ozone systems that included a variety of corona discharge and ultraviolet systems for residential, commercial, industrial and agricultural applications