DC-910900-1.2, Duracast 900 Gallon Plastic Water Tank | 910900 Keep your water securely stored in Duracast’s 900 gallon plastic tanks. These water storage tanks are made of FDA-approved polyethylene resin so that you can store potable water without it becoming contaminated. Manufactured to the highest standards in the industry, these plastic water tanks will not break down easily in stressful conditions. These tanks feature high-impact strength and can withstand frigid temperatures as well as harsh UV rays. People can use these tanks for irrigation purposes, farming, well storage and to collect rainwater. For better outdoor storage, use black and green tanks to slow down the growth of waterborne algae. This is a 1.2 specific gravity tank.