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Regular price $960.00 AUD
Regular price Sale price $960.00 AUD
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Please call us for freight, we can deliver Australia wide and its not that expensive 02 4312 5545

The SPT1500 Three Chamber Septic Tank  is a great solution for off-grid waste management needs. Its 1500-litre capacity and three-chamber design means that it's designed to handle sewage treatment in various settings, from residential to commercial and industrial areas. This type of septic tank is commonly used in places where traditional centralized sewage systems are not available or practical. Can handle up to 6 people.

The three-chamber design  refers to the separation of the tank into three compartments, each serving a specific function in the sewage treatment process. Generally, the chambers are used for primary settling, anaerobic digestion, and secondary settling. Here's a basic breakdown of how these chambers typically work:

  1. Primary Settling: In the first chamber, heavy solids settle at the bottom of the tank, forming a layer of sludge, while lighter particles and scum float to the top. This process allows initial separation of solids from the liquid wastewater.

  2. Anaerobic Digestion: The second chamber facilitates anaerobic bacterial activity. Anaerobic bacteria break down the organic matter in the wastewater, converting it into gases (like methane) and more stable substances. This helps reduce the volume of solids and organic materials in the tank.

  3. Secondary Settling: The third chamber provides further settling of any remaining solids and allows any suspended particles to settle before the treated water moves out of the tank.

Efficient waste treatment in a septic tank relies on the natural processes of bacterial breakdown and settling. Regular maintenance and pump-outs are typically necessary to prevent the accumulation of solids that can clog the system over time.

When considering this solution, it's important to keep in mind factors such as the frequency of use, the number of users, local regulations, and maintenance requirements. 


The clamshell design indicates that the tank is manufactured in two separate halves that are fitted together during installation.

Buried Installation: The tanks are intended to be buried in the ground during installation. This is a common approach for septic tanks as it provides a natural insulating environment and prevents freezing during cold weather. Buried tanks also help in maintaining a more uniform temperature for the biological processes within the tank.

Inlet and Outlet Pipes: As with most septic tanks, holes need to be cut into the tank for the inlet pipes that bring wastewater into the tank and the outlet pipes that allow treated water to exit the tank. Proper positioning of these pipes is crucial for efficient operation.

Polypropylene Material: Polypropylene is a commonly used material in septic tank construction due to its durability, resistance to chemicals and corrosion, and ability to withstand the conditions within the tank.

The inclusion of three observation portholes in the SPT1500 Three Chamber Septic Tank is a valuable feature for monitoring and maintenance purposes. These portholes allow you to visually inspect each partition section of the tank without needing to open the tank itself. This is especially useful for assessing the level of solids, scum, and overall condition of the tank's contents.

Moreover, the portholes can serve as access points for waste pump-out providers. This is a practical design element, as periodic pump-outs are necessary to remove accumulated solids from the tank. Pumping out the tank helps prevent clogs and ensures that the tank continues to function effectively.

The option to connect the SPT1500 tank to a leach field or absorption trench system is significant. Once the wastewater has undergone treatment in the three chambers and has had the solids separated out, the resulting clear liquid waste can be further treated and disposed of in an environmentally friendly way. Leach fields or absorption trenches are part of an on-site wastewater disposal system that allows the liquid waste to be safely distributed and absorbed into the surrounding soil.

Combining the septic tank with a leach field or absorption trench system helps complete the wastewater treatment process and allows the treated effluent to be naturally filtered and absorbed back into the environment. This is an essential step in minimizing the impact of wastewater on local ecosystems.

However, it's important to note that the design and installation of leach fields or absorption trenches require careful consideration of factors such as soil type, groundwater levels, and local regulations. Improperly designed or installed leach fields can lead to environmental contamination, so it's advisable to work with professionals who have expertise in designing and installing these systems to ensure compliance and environmental protection.

In summary, the SPT1500 Three Chamber Septic Tank is to be designed with practical features that facilitate maintenance, efficient wastewater treatment, and environmentally responsible waste disposal through the use of leach fields or absorption trenches.


  • Size: 2009mm(L) * 1082mm(W) * 1037mm(H)
  • Weight: 48kg
  • Thickness: 4mm
  • Material: PP+PE
  • Observation Holes: 315mm * 200mm * 200mm
  • Number of users: 2 - 4


Top shell, bottom shell, 2x partitions, observation covers, bolts & nuts for closing tank

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