SteelCore® Indoor/Outdoor, Open top Tanks for Wastewater and other liquids. Fully stiffened and structurally engineered for the application and specific gravity intended. This project recently completed by National Storage Tank, Inc. in Arizona was very rewarding. This project required alot of detail and coordination by all subs, with safety of the utmost importance. National Storage Tank, Inc teams are OSHA certified, with safety being the highest priority. Contact us today to discuss your project. Our tank experts are here to provide you options and discuss what product best suits your application. Contact us today.