DC-900330-1.2, Duracast 330 Gallon Plastic Water Tank | 900330 Collecting rainwater and using it to water your lawn is one smart way to use water efficiently. To collect and store rainwater, use one or more of these plastic water tanks from Durast. These plastic tanks will keep water from becoming contaminated so that water can be stored for as long as you need. If you want to store drinking water, these tanks are made of "Food Grade" FDA approved resin and will keep your potable water safe. To slow the growth of waterborne algae, store water in black or green vertical tanks. The darker colors of these tanks are more effective at blocking the green spectrum of sunlight than the natural white option.