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The benefits ofXerxes' fiberglass underground s -orage tanks The best choice for underground storage of petroleum products is a structurally strong, corrosion -resistant, easily installed and cost-effective vessel. That's what a customer finds in every Xerxes tank, which is designed and manufactured with high-quality resin and glass, and features unique integral ribs. Like structural beams, integral ribs add strength, and because the ribs and tanks are made of the same materials and are manufactured simultane- ously, the result is an extremely robust product. The solution to new corrosion concerns Made of corrosion -resistant materials, Xerxes fiberglass tanks eliminate the possibility of either external or internal rusting of the tank. For years, the concern in the petroleum industry was about external corrosion. Since fiberglass doesn't rust, and steel can, this gave fiberglass tank manufacturers a natural edge. Today, corrosion concerns in petroleum tanks center on internal corrosion, an even more pressing matter because of new fuels, such as ethanol blends and biodiesels. Together, the removal of lead from gasoline and the growing popularity of biofuels have led to heightened awareness about corrosive environments inside storage tanks. A certain amount of water usually exists in the bottom of tanks, and that can lead to the microbial -induced corrosion (MIC) in steel tanks. Ethanol increases the likelihood of water in tanks, and the resulting microbial growth. To date, there is not a single reported instance in a fiberglass tank of failure due to internal corrosion caused either by MIC or by water bottoms. Based on widely dis- tributed advice, combatting internal corrosion in steel tanks re- quires regular maintenance — in the form of frequent inspection for and removal of water from tank bottoms. In contrast, fiber- glass tanks require no maintenance against corrosion. Many believe that this new concern about internal corrosion is the reason the Steel Tank Institue (STI) and some steel -tank man- ufacturers have significantly reduced their warranty coverage, from 30 to 10 years. Since Xerxes fiberglass tanks are compatible with the new biofuels, including E10, E85 and biodiesel blends, Xerxes confidently holds to its longstanding 30 -year warranty, which explicitly provides 30 years of internal corrosion coverage "With or without water bottoms."