DC-900525-1.5, Duracast 525 Gallon Plastic Storage Tank | 900525 These vertical storage tanks are designed for maximum satisfaction. Rotationally molded, these plastic tanks do not have any seams or joints and are much less likely to crack or leak than other plastic alternatives. These tanks are highly resistant to stressful conditions, and can handle unfavorable climates and aggressive contents like chemicals. Their resilience allows these tanks to retain their shape, even after being severely distorted. Black and green colored tanks block the green spectrum of light, which slows the growth of algae. The natural white tanks are translucent, and allow for easy viewing of contents. People can use these tanks to store industrial/agricultural chemicals, most liquid acids, liquid fertilizers and potable water. This is a 1.5 specific gravity tank.