Design Tanks has been manufacturing fiberglass-reinforced plastic tanks for more than 40 years. Centrally located in Sioux Falls, S.D., Design Tanks provides engineering, design and manufacturing processes. Design Tanks works with each customer on a one-on-one basis, handling a project from conception to delivery and following up with service. Its products include custom-engineered products, bulk fertilizer, sectionalized, round, rectangular and square tanks. Each fiberglass tank is designed, engineered and manufactured to meet customer specifications, and the company provides a wide range of options in sizes, top covers and bottoms of tanks. The tank accessories provided by Design Tanks include flanged connections, couplings, bulkhead fittings, vents, downpipes, baffles and gussets, mixer bars and hold-down lugs. The company provides its fiberglass tanks for the storage of chemical, water, pharmaceutical, paper, agriculture, mineral and food.