Basement drainage in Vietnam: Sanipump or Sanicubic?

Vietnam’s rainy season can place significant pressure on urban drainage systems. For homes, hotels, offices, and commercial buildings with basements, reliable wastewater drainage is especially important because the basement is the lowest point in the building.

A basement may receive wastewater from toilets, washbasins, showers, kitchens, laundry areas, or other facilities. When these fixtures are located below the main drainage connection, wastewater cannot flow away by gravity alone. The project therefore needs a system that can collect the wastewater and pump it to a higher connection point.

There are two common approaches: an underground collection sump fitted with a Sanipump submersible sewage pump, or a sealed Sanicubic lifting station installed directly on the basement floor.

Key highlights

• Context: Heavy rain can put additional pressure on drainage systems serving buildings with basements.
• Challenge: Basement wastewater may sit below the main drainage connection and cannot flow away naturally.
• Options: Projects can use an underground sump with a Sanipump or a sealed Sanicubic lifting station.
• Decision: The right system depends on the wastewater type, building structure, expected flow, available space, and maintenance requirements.

Why basement wastewater cannot always drain by gravity

A conventional drainage system needs a continuous downward gradient. Wastewater flows from the fixtures through the pipework and eventually reaches the main drain or approved discharge point.

This arrangement becomes difficult when the fixtures are below the level of the main drainage connection. The pipes no longer have enough elevation to carry wastewater away naturally. This is common in:

• Basement bathrooms and toilets
• Underground kitchens or pantries
• Basement laundry areas
• Spa and changing-room facilities
• Underground garages with wash points
• Commercial spaces located below street level

In these situations, wastewater must first be collected and then pumped upwards. The pumping system should be selected according to the type of wastewater, the number of connected fixtures, the required pumping height, and the expected volume during peak use.

A wastewater sump is different from a septic tank

The terms “sump” and “septic tank” are sometimes used interchangeably, but they serve different functions.

A wastewater sump is a temporary collection chamber. It receives wastewater from connected fixtures and holds it until the pump transfers it to the main drainage system.

A septic tank is designed to retain wastewater for settling and biological decomposition. It is a treatment and storage structure, not simply a collection chamber.

For a basement drainage project, a separate septic tank may not be necessary. In many cases, wastewater can flow into a dedicated sump before being pumped to an approved connection point. The final arrangement should be confirmed during the technical design stage.

Option 1: An underground sump with a Sanipump

A Sanipump submersible sewage pump is installed inside a suitable underground collection sump. Wastewater from the basement fixtures flows into the sump, and the pump starts automatically when the water level reaches the activation point.

The pump then transfers the wastewater upwards through the discharge pipe to the building’s main drainage connection.

This option may be appropriate when:

• The building is still under construction
• An underground sump has already been included in the design
• Excavation and waterproofing work are possible
• The pump needs to remain submerged inside the collection chamber
• The project has sufficient space for inspection and maintenance access

The sump must be properly waterproofed and sealed. Designers should also consider ventilation, access covers, odour control, and safe maintenance access before construction begins.

An underground sump can provide a practical solution, but it requires more structural preparation. If it is added to an existing basement, excavation and waterproofing may affect the floor and surrounding finishes.

Read more: Sanipump – Sewage pumps for reliable wastewater management

Option 2: A sealed Sanicubic lifting station

A Sanicubic lifting station combines the collection tank and pumping mechanism in a sealed, floor-standing unit. Wastewater enters the station from the connected fixtures and is automatically pumped to the main drainage connection.

Because the tank is integrated into the unit, the project does not need to build a separate underground sump. This can reduce excavation and waterproofing work, particularly during renovation or fit-out projects.

A sealed lifting station may be suitable for:

• Existing basements that are already finished
• Renovation projects where floor breaking should be limited
• Villas, shophouses, hotels, and office buildings
• Basement bathrooms and service areas
• Projects where odour control and maintenance access are important
• Installations requiring wastewater collection from multiple fixtures

Depending on the model, Sanicubic can accommodate wastewater from toilets and other fixtures such as washbasins, sinks, showers, baths, washing machines, and dishwashers. The selected model must match the type and volume of wastewater expected at the site.

For example, the Sanicubic 2 Classic uses two pumps that operate alternately. This configuration helps distribute the operating load and provides additional continuity if one motor requires service. Product selection should still be based on a site assessment rather than the number of motors alone.

Read more: Sanicubic - Commercial and industrial wastewater to be pumped

Sanipump or Sanicubic: which option is more suitable?

Both systems are designed to pump wastewater from below the main drainage level, but their installation requirements are different.

There is no single option that is automatically suitable for every basement. A Sanipump may be the right choice when the sump is already part of the building design. A Sanicubic lifting station may be more practical when the project is being renovated and the owner wants to limit floor excavation.

What should be checked before selecting a system?

Before choosing between a Sanipump and a Sanicubic lifting station, the project owner, designer, or contractor should review:

• The type of wastewater entering the system
• The number and type of connected fixtures
• Expected daily use and peak flow
• Required vertical lift
• Horizontal pipe distance to the discharge point
• Available space for the equipment
• Whether excavation and waterproofing are possible
• Required ventilation and odour-control measures
• Electrical supply and equipment access
• Planned maintenance and inspection route
• The location of the approved drainage connection

Rainwater should normally be designed separately from domestic wastewater. Surface water entering a basement during heavy rain may require a dedicated drainage channel, sump, or stormwater pumping system based on the building layout and local requirements.

Conclusion

Basement wastewater drainage requires more than simply connecting a pipe to the nearest drain. When the basement is below the main drainage level, wastewater needs to be collected and pumped upwards through a properly designed system.

An underground sump with a Sanipump can be suitable for new construction or projects with an existing collection chamber. A sealed Sanicubic lifting station can offer a more practical approach for renovations, finished basements, and projects where floor excavation should be limited.

The right choice depends on the building structure, wastewater characteristics, expected flow, pumping distance, and maintenance requirements. A technical assessment should be completed before installation.

→ Contact SFA Pumps Vietnam for advice on the right basement wastewater drainage solution for your project.