Self-Rising & Self-Supporting Open-Top Onion Tanks

Our Emergency Water Storage Onion Tank (also called pumpkin water tanks and blivets) is the perfect way to store and supply water quickly during emergency events. Designed with an open top, self-rising tank walls, and easy access fittings, Hydrostar open-top onion tanks can be moved and set up in minutes, making them ideal for any of the following uses:

  • Temporary Water Storage
  • Rural or Military Water Storage
  • Hazardous Waste
  • Potable Water Storage
  • Decontamination
  • Disaster of Emergency Relief
  • Firefighting Efforts
  • Hot Tub Servicing
  • Water Relay

Onion Tank Fabric Options

  • 22 oz. Yellow PVC (up to 2,500 gallons)
  • 40 oz. Black PVC
  • 30 oz. Black Elvaloy
  • 30 oz. PW Blue Elvaloy

Learn more About Open Top Hydrostar Emergency Water Storage Tanks

Portable Onion Tanks, also known as blivets or pumpkin water tanks, have self-rising tank walls, sizes from 250 to 10,000 gallons, and come with:

  • Floating Foam – no inflation required
  • Heavy Duty PVC Material (Black or Yellow)
    • 30 oz. Black or PW Blue Elvaloy available
  • Welded Seams for Long Life
  • Side Support
    • Low or High Side Walls
  • Optional Accessories:
    • Covers
    • Ground Cloth

These flexible tanks are operational in minutes and are used for temporary liquid storage where response time is critical. Onion Tanks can store water, recovered hazardous materials, oil hazardous materials (HAZMAT), and other liquids.

These Emergency Water Storage Tanks can store multiple liquids* including:

  • Water (gray, black)
  • Drinking Water (potable water fabric available upon request)
  • Recovered Crude Oil
  • Jet Fuel*
  • Firefighting Foam
  • Sewage and Other Contaminants

*Not all fabrics are suitable for all uses. Please let us know how you plan to use your Onion Tank so we can ensure it’s constructed with the right fabric and coating for your specific needs.

Emergency Relief & Response: Fast & Easy Emergency Water Storage

The Emergency Water Storage Tank is made tough and designed with self-supporting walls that rise as the Onion Tank fills with water. When compared to other water storage tanks, these open top Onion Tanks offer the following advantages:

  • Tank Rises as Filled with Liquid
  • Fast Set up on Site
  • Lays Flat for Transport
  • Open Top
  • Large Storage Space
  • Multiple Sizes
  • Folds Quickly for Convenient Storage
  • Sets up in Minutes
  • Self Rising and Self Supporting