E.R. Jahna Industries is one of Florida s leading suppliers of aggregate material for construction, road building, manufacturing and agriculture. Since 1950, the company has delivered products and services to jobsites, plants, factories and farms. Its sand products include concrete aggregates, filtration media, golf course and recreational sands, foundry sands, construction aggregates, agricultural and fertilizer filler and mortar and grout sand. The company also provides rock products, such as construction aggregates, road base material, concrete aggregates, calcium products, gravel and asphalt aggregate.