Toptank 2000L Underground Spherical Water Tank

Toptank 2000L Spherical Tank

The Toptank 2000L Underground Tank provides a high-capacity subsurface storage solution for potable water and rainwater harvesting systems. This rotationally molded vessel utilizes high-density polyethylene to withstand soil pressure and environmental degradation. It is specifically engineered for sites where surface space is limited or where aesthetic requirements necessitate hidden storage infrastructure.

Built for the Job

Contractors and site supervisors select this spherical unit due to its superior load distribution properties compared to rectangular alternatives. The rounded geometry naturally resists the inward pressure of surrounding earth, reducing the risk of wall collapse or deformation over time. It serves as a reliable reservoir for residential backup, commercial irrigation, or construction site water management. Because the material is non-corrosive, it eliminates the maintenance issues associated with traditional concrete or steel underground pits.

• Subsurface rainwater collection for large-scale landscaping and irrigation.

• Potable water storage for residential developments with restricted footprints.

• Firefighting water reserves in remote or space-constrained facility locations.

Product Highlights

Structural Integrity

The heavy-duty ribbed design increases the surface area and stiffness of the tank walls to prevent buckling under heavy backfill.

Material Specifications

• Food-grade polyethylene construction ensures zero contamination of stored water.
• Seamless molding process removes potential leak points found in fabricated tanks.

Technical Specifications

What’s Included

• 1 x 2000 Litre Spherical Underground Tank

• 1 x Integrated Inspection Cover/Lid

On-Site & Workshop Notes

• Always follow the manufacturer’s excavation guidelines, ensuring a level base of compacted sand or lean concrete before lowering the unit.

• Backfilling should occur simultaneously with water filling to equalize internal and external pressure during the setup phase.

• This storage vessel is not intended for use in high-traffic areas unless a reinforced concrete slab is installed above the tank pit.

• Use a 1:10 cement-to-sand ratio for the surrounding backfill material to ensure long-term stability in shifting soil conditions.