Managing sewage is one of the most important parts of building a home or commercial property in Ghana.
Yet for many property owners, sanitation is considered only after the main building has already been designed.
That can create serious problems.
A poorly planned wastewater system can lead to overflowing soakaways, unpleasant odours, frequent maintenance, wastewater pooling around a property, and expensive repairs.
For properties without access to a public sewer system, choosing an appropriate wastewater solution is therefore a major engineering decision.
One solution gaining attention is the Sisal Biomechanical Drainage System (SBDS).
Developed by Sisal Engineering & Construction, SBDS is designed to manage domestic sewage through biological treatment and controlled drainage for properties where public drainage infrastructure does not reach. The system is available in residential classifications from RC1 to RC7, with custom configurations available for larger commercial developments.
But what exactly is SBDS, how does it work, and is it suitable for your property?
This guide explains everything you need to know before choosing a SBDS system in Ghana.
What Is SBDS?
SBDS stands for Sisal Biomechanical Drainage System.
It is a wastewater management system developed by Sisal Engineering & Construction to address domestic sewage challenges in areas without suitable public drainage or sewer infrastructure.
Unlike a conventional approach that relies heavily on a septic tank and soakaway arrangement, SBDS is designed around biological wastewater treatment and filtration, with treated wastewater being released into the soil through the system’s drainage arrangement.
The system was developed after Sisal identified recurring problems associated with septic tank and soakaway failures.
According to the company, SBDS is intended to provide an alternative approach to domestic sewage management, particularly for properties where public drainage systems are unavailable.
This makes SBDS particularly relevant to homeowners and developers building in areas of Ghana where connecting to a public sewer is not an option.
Why Was SBDS Developed?
The need for alternative wastewater solutions is closely connected to the way many properties in Ghana manage sewage.
Where public sewer infrastructure is unavailable, individual properties often depend on systems such as septic tanks and soakaways.
These systems can work when properly designed and maintained.
However, problems can occur when:
- The soil does not infiltrate wastewater effectively
- The soakaway is poorly designed
- The system is undersized
- The property produces more wastewater than expected
- Construction quality is poor
- The system is not properly maintained
- Ground conditions are unsuitable
- A property is expanded without upgrading its sanitation infrastructure
Sisal Engineering developed SBDS specifically in response to septic tank and soakaway failures in areas without public drainage systems.
The objective is therefore not simply to create another underground tank.
It is to provide an engineered approach to wastewater treatment and drainage.
How Does the Sisal Biomechanical Drainage System Work?
At a practical level, SBDS is designed to receive wastewater from a property, treat it biologically through a series of system components, and then allow the treated wastewater to move through the drainage system into the soil.
The exact configuration depends on the classification and requirements of the property.
Sisal’s published information describes SBDS as using biological treatment and filtration, with residential systems ranging from RC1 to RC7.
The company’s current information also identifies components such as filtration chambers, drainage fields and, depending on the configuration, other system components.
The important point for property owners is that SBDS should not be viewed as a simple “dig a hole and connect pipes” solution.
It is an engineered sanitation system.
That means the system should be selected, sized and installed according to the requirements of the property and site.
What Happens to Wastewater Inside a SBDS System?
The wastewater treatment process involves biological activity and filtration.
Wastewater entering the system contains organic matter and other materials that need to be treated before the resulting liquid can be managed safely.
SBDS uses its treatment and filtration stages to process the wastewater before it reaches the drainage field.
This approach is important because wastewater management is not simply about finding somewhere to dispose of sewage.
The objective is to manage the wastewater in a controlled way while reducing the problems associated with untreated or poorly managed sewage.
For this reason, the design of the treatment chambers, drainage field and associated components matters.
SBDS vs Septic Tank: What Is the Difference?
One of the most common questions homeowners ask is whether SBDS is simply another type of septic tank.
It isn’t.
A conventional septic tank is primarily used to receive wastewater, allow solids to settle and separate, and send liquid effluent onward to a soakaway or other disposal arrangement.
SBDS is designed around biological treatment and filtration as part of the wastewater management process.
Here is a simplified comparison:
| Feature | Conventional Septic System | SBDS |
|---|---|---|
| Primary purpose | Wastewater settling and containment | Biological wastewater treatment and drainage |
| Common configuration | Septic tank + soakaway | SBDS treatment and drainage system |
| Biological treatment | Occurs within septic process | Central to the SBDS approach |
| Soil conditions | Important | Important |
| Professional design | Recommended | Essential |
| Residential applications | Yes | Yes |
| Commercial applications | Possible | Custom configurations available |
| Classifications | Varies by design | RC1–RC7 for residential systems |
| Developed by Sisal | No | Yes |
This comparison is simplified. The actual performance of either system depends on design, installation, site conditions, loading and maintenance.
What Are the Benefits of SBDS in Ghana?
SBDS can offer several potential advantages when it is appropriately designed and installed.
1. It provides an alternative where public sewers are unavailable
Many properties do not have access to public sewer infrastructure.
SBDS is specifically positioned by Sisal for domestic sewage management in areas where public drainage systems do not reach.
This makes it relevant for:
- Private homes
- Residential developments
- Estates
- Schools
- Hotels
- Other facilities
For larger commercial projects, Sisal states that custom SBDS configurations can be developed according to the project requirements.
2. It uses biological wastewater treatment
One of the defining features of SBDS is its biological treatment approach.
Rather than focusing only on storing wastewater, the system is designed to treat wastewater before it is released through the drainage arrangement.
3. It addresses common septic and soakaway problems
Sisal developed SBDS after identifying recurring failures associated with septic tanks and soakaways.
This is particularly relevant where a property experiences issues such as:
- Frequent overflowing
- Poor infiltration
- Repeated soakaway failure
- Unpleasant odours
- Wastewater pooling
- High maintenance demands
However, SBDS should not be presented as a universal cure for every drainage problem.
A professional assessment is still necessary.
4. It has different residential classifications
Not every home has the same wastewater requirements.
A small house and a large seven-bedroom residence should not automatically receive the same sanitation system.
Sisal therefore offers residential SBDS classifications from RC1 to RC7.
This allows the system to be selected according to different residential requirements.
5. It can be adapted for larger developments
SBDS is not limited to individual homes.
Sisal states that it provides custom commercial configurations for developments including hotels, schools and estates.
For developers, this is important because larger developments require sanitation planning based on expected wastewater loads rather than simply installing several residential systems without proper engineering consideration.
Understanding SBDS RC1 to RC7
One of the most important things to understand before buying SBDS is that there is no single SBDS configuration for every property.
Sisal’s residential systems are classified from RC1 through RC7.
The company’s current pricing information describes RC1 as the most complex residential configuration and RC7 as the simplest and most cost-effective classification.
The classification is therefore an important part of determining which system is appropriate.
However, homeowners should not assume that the highest or lowest classification is automatically the best choice.
The correct system should be based on the property’s requirements.
Factors that can influence the decision include:
- Number of bedrooms
- Expected occupancy
- Wastewater generation
- Property layout
- Site conditions
- Available land
- Future expansion
- Type of development
- Drainage requirements
Who Can Use SBDS?
SBDS can be relevant to several types of property owners.
Homeowners
If you are building a house without access to a public sewer, SBDS can be considered as part of your sanitation planning.
It can also be worth investigating if an existing septic and soakaway arrangement repeatedly fails.
Property Developers
Developers constructing multiple residential units need sanitation systems that can be planned alongside the overall development.
SBDS can be considered during the design stage rather than added after the buildings are already completed.
Estate Developers
Larger residential estates have greater wastewater requirements.
The sanitation system should therefore be designed around the number of units, expected occupancy and overall development.
Schools
Schools can generate significant wastewater volumes because of the number of people using their facilities each day.
Sisal lists schools among the types of commercial developments for which custom SBDS solutions can be configured.
Hotels
Hotels have different wastewater patterns from ordinary residential houses.
Guest numbers, bathrooms, kitchens, laundry facilities and other services can all influence wastewater generation.
This is why a commercial SBDS system should be professionally designed around the particular property.
Is SBDS Suitable for Every Home in Ghana?
No.
And this is an important point.
A responsible engineering company should not claim that one sanitation system is automatically the best option for every property.
SBDS suitability depends on the site and project requirements.
Before installation, factors such as soil conditions, available space, expected wastewater volume and property use should be considered.
A professional site assessment can help determine whether SBDS is appropriate and which configuration should be used.
This is also why choosing a sanitation system based solely on the cheapest quoted price can be risky.
The cheapest system is not necessarily the most economical solution over the long term.
What Should Be Checked Before Installing SBDS?
Before installing a SBDS system, several important questions should be answered.
1. How many people will use the property?
Occupancy affects wastewater generation.
A system designed for a small household may not be appropriate for a much larger household or a property that will accommodate tenants.
2. How many bedrooms does the property have?
Bedroom count can help determine residential requirements, but it should not be the only factor.
3. What are the soil conditions?
The movement of treated wastewater into the ground depends on site conditions.
Understanding the soil is therefore an important part of wastewater system planning.
4. How much space is available?
The system and drainage arrangement must fit appropriately within the property.
5. Will the property be expanded?
If you intend to add rooms, floors or additional buildings in the future, this should be considered before installing the sanitation system.
6. Is the property residential or commercial?
A private house, hotel and school can have very different wastewater demands.
The system should reflect the actual use of the property.
How Much Does SBDS Cost in Ghana?
There is no single SBDS price that applies to every property.
Sisal’s current pricing structure is based on residential classifications from RC1 to RC7, with different configurations and requirements. The company also provides custom commercial systems.
The total project cost can depend on:
- SBDS classification
- Site conditions
- Excavation
- Materials
- Labour
- Plumbing connections
- Drainage field requirements
- Property size
- Installation complexity
- Commercial or residential use
This is why it is better to request a project-specific quotation than to rely on a generic online figure.
Sisal’s website encourages potential customers to contact the company to discuss which solution is appropriate for their project.
Is SBDS More Expensive Than a Septic Tank?
The answer depends on what is being compared.
If you compare only the initial construction price, one system may appear cheaper than the other.
But sanitation should be evaluated beyond the installation price.
Consider:
- Initial installation
- Maintenance
- Desludging requirements
- Repairs
- Replacement costs
- Long-term performance
- Suitability for the soil
- Future expansion
- Wastewater management requirements
A poorly designed cheap system can become expensive when it repeatedly fails.
A properly engineered system should therefore be evaluated based on value, suitability and expected long-term performance, not just the initial quotation.
How Long Does a SBDS System Last?
The lifespan and performance of any wastewater system depend on factors such as:
- Design
- Construction quality
- Materials
- Site conditions
- Wastewater loading
- Usage
- Maintenance
- Installation quality
For this reason, it would be misleading to give every SBDS installation a single guaranteed lifespan without considering the specific system and conditions.
The best way to protect the long-term performance of a SBDS installation is to have it properly designed and installed and to follow the recommended maintenance requirements.
Does SBDS Require Maintenance?
Yes.
The fact that SBDS uses biological treatment does not mean the system can simply be installed and forgotten.
Like other engineered wastewater systems, it should be inspected and maintained appropriately.
Maintenance helps identify potential problems before they develop into major failures.
This can include checking:
- System components
- Drainage areas
- Flow conditions
- Filtration components
- Connections
- Any unusual odours
- Any signs of wastewater pooling
The specific maintenance requirements depend on the SBDS configuration.
Why Professional Installation Matters
One of the biggest mistakes property owners can make is treating a wastewater system as a simple plumbing job.
SBDS involves wastewater treatment, filtration, drainage and site considerations.
Poor installation can undermine even a technically sound design.
Professional installation helps ensure that:
- The appropriate classification is selected
- The system is correctly positioned
- Components are properly installed
- Connections are correctly made
- Drainage is appropriately planned
- The system matches the property’s requirements
Sisal Engineering combines engineering, design, construction and sanitation services rather than treating SBDS as an isolated product. The company’s stated process moves from consultation and site assessment through design and costing, installation, and handover/support.
Why Choose Sisal Engineering for SBDS in Ghana?
Choosing a SBDS system is only one part of the equation.
The company designing and installing it also matters.
Sisal Engineering & Construction was founded in 2019 by ENGR. Moro Abdul Fatau, an IET Ghana certified civil engineer. The company says it developed SBDS after researching sanitation challenges associated with septic tank and soakaway failures.
Its current website identifies SBDS as one of its own sanitation innovations and reports more than 100 systems installed across homes and facilities.
The company also provides training for professionals and artisans on SBDS installation and maintenance, including site assessment, system sizing and selection of RC1–RC7 or commercial configurations.
This creates an important advantage for a customer.
You are not simply buying an underground sanitation product.
You can work with a company whose broader expertise includes:
- Civil engineering
- Architectural design
- Structural engineering
- MEP design
- Construction management
- SBDS
- Biofil sanitation
- Professional technical training
That integrated knowledge can be particularly valuable when SBDS is being installed as part of a new building project.
SBDS for New House Construction in Ghana
If you are planning to build a house, sanitation should be considered before construction begins.
Do not wait until the foundation is completed before deciding where your wastewater system will go.
Instead, consider SBDS during the planning and design stage.
This allows the engineering team to consider:
- Building layout
- Plumbing routes
- Available land
- Drainage
- Sanitation location
- Soil conditions
- Future development
- Access for maintenance
Integrating the sanitation system into the building design from the beginning can help reduce costly changes later.
SBDS for Existing Properties
SBDS can also be relevant when an existing property experiences recurring sanitation problems.
For example, if your property repeatedly experiences:
- Overflowing soakaways
- Wastewater pooling
- Bad odours
- Frequent septic emptying
- Drainage failures
it may be time to stop treating each failure as an isolated repair.
Instead, consider investigating the underlying cause.
Sometimes the problem is not simply a blocked pipe.
The entire wastewater management system may need to be reassessed.
A professional site assessment can determine whether SBDS or another solution is appropriate for the property.
SBDS for Hotels, Schools and Estates
Large developments require a different approach to sanitation.
A hotel may have dozens of bathrooms, kitchens, laundry facilities and guests.
A school may have hundreds of students and staff using toilets and washing facilities every day.
An estate may contain many individual homes sharing a development environment.
These properties cannot always be treated like ordinary residential houses.
Sisal therefore provides custom SBDS configurations for commercial developments including hotels, schools and estates.
For these projects, the wastewater system should be designed around actual or expected wastewater demand and the characteristics of the development.
Common Mistakes to Avoid When Installing a Sewage System
Whether you choose SBDS, a septic tank or another wastewater solution, avoid these common mistakes.
Choosing based only on price
The cheapest installation is not necessarily the best value.
Copying a neighbour’s system
Your property may have completely different soil, occupancy and drainage conditions.
Ignoring future expansion
Adding rooms or buildings later can increase wastewater demand.
Using unqualified installers
Poor installation can cause problems even when the underlying system is technically sound.
Treating sanitation as an afterthought
Your wastewater system should be considered during building design.
Ignoring maintenance
No engineered system should be installed and forgotten.
Failing to assess the site
Site conditions can have a major influence on wastewater management.
Is SBDS a Good Investment for a Ghanaian Home?
For the right property, SBDS can be a valuable long-term sanitation solution.
But the real question is not:
“Is SBDS good?”
The better question is:
“Is SBDS properly suited to my property?”
That depends on your site’s conditions, the number of people using the building, wastewater generation, available space, property type and future plans.
When those factors are properly considered, the sanitation system becomes part of the property’s engineering design rather than simply an underground structure added at the end of construction.
Frequently Asked Questions About SBDS in Ghana
SBDS stands for Sisal Biomechanical Drainage System, a wastewater management solution developed by Sisal Engineering & Construction.
SBDS is designed to manage domestic sewage through biological treatment and drainage, particularly for properties where public sewer or drainage infrastructure is unavailable.
SBDS and septic systems use different approaches to wastewater management. Whether SBDS is better for a particular property depends on site conditions, wastewater requirements, design and long-term maintenance considerations.
Sisal provides residential SBDS classifications from RC1 to RC7, along with custom configurations for commercial developments.
The appropriate classification depends on the property’s size and requirements. Bedroom count can provide an initial indication, but a professional assessment should be used to determine the appropriate system.
Yes. Sisal states that custom SBDS configurations are available for commercial developments including hotels, schools and estates.
SBDS costs vary according to the classification, property requirements, site conditions, installation complexity and other project factors. Sisal provides different residential classifications and custom commercial solutions rather than one universal price.
Yes. Proper maintenance and inspection are important for maintaining the performance of any engineered wastewater system.
Ready to Find Out if SBDS Is Right for Your Property?
Choosing a wastewater system should not be a guessing game.
Whether you are building a new house, developing an estate, managing a school or hotel, or dealing with a recurring septic or soakaway problem, the right solution starts with understanding the property.
Sisal Engineering & Construction can assess your project and help you determine an appropriate SBDS solution.
The company provides residential SBDS systems from RC1 to RC7, as well as custom configurations for larger developments. Its wider engineering services also include architectural design, structural engineering, MEP design and construction management.
Instead of waiting for your septic system to fail, get professional advice before making the investment.
Request a SBDS Consultation
Contact Sisal Engineering & Construction to discuss your property, site requirements and wastewater needs.
Phone: 0594 081 487 / 0572 686 649
Email: Sisalengineeringconstruction@gmail.com
Website: Sisal Engineering & Construction