Sisal Biomechanical Drainage System
An innovative wastewater management system developed by Sisal Engineering and Construction — combining mechanical filtration with natural biological treatment to improve the treatment and disposal of domestic wastewater, even in poor and challenging soils.
Mechanical filtration meets biological treatment.
The Sisal Biomechanical Drainage System (SBDS) was developed through extensive research, field observation and practical experience in addressing the shortcomings of conventional drainage and soakaway systems — particularly in areas with poor soil permeability and challenging site conditions.
Our research identified the common causes of drainage failure: poor filtration efficiency, rapid clogging, environmental pollution, groundwater contamination, and reduced performance in waterlogged and clayey soils. The SBDS integrates mechanical filtration with natural biological treatment, combining carefully selected filtration media with engineered hydraulic flow to improve wastewater quality before discharge or infiltration — while reducing maintenance and extending the operational life of the drainage infrastructure.
The system is designed for wastewater from kitchens, bathrooms and laundry facilities, as well as treated septic-tank or biofil-toilet effluent — making it suitable for residential, commercial and institutional developments.
What the SBDS is built to do.
Better treatment
Improves the treatment of domestic wastewater before discharge or infiltration.
Longer service life
Reduces clogging and extends the working life of the drainage system.
Protects groundwater
Minimises environmental pollution and protects groundwater resources.
Works in hard soils
Reliable performance in challenging conditions, including clayey and waterlogged areas.
Sustainable
Promotes environmentally responsible wastewater management.
Cost-effective
Durable drainage solutions suited to a wide range of developments.
Conventional soakaway vs SBDS.
Conventional drainage & soakaway
- Poor filtration efficiency
- Clogs rapidly, especially in clay soils
- Struggles in waterlogged ground
- Risk of pollution and groundwater contamination
- Frequent failure and short service life
Sisal Biomechanical Drainage System
- Mechanical filtration plus biological treatment
- Engineered hydraulic flow resists clogging
- Performs in clayey and waterlogged soils
- Protects groundwater and the environment
- Longer service life, lower maintenance
For homes, businesses and institutions.
Residential
Homes and estates needing reliable wastewater management where public sewers do not reach.
Commercial
Offices, hotels and commercial buildings with everyday wastewater loads.
Institutional
Schools, clinics and facilities requiring dependable, low-maintenance drainage.
The SBDS also treats effluent from our Mechanized Septic Tank and Mechanized Biofil Toilet systems, and can be paired with greywater management for complete on-site wastewater handling.
From site assessment to a working system.
01. Free site assessment
We assess soil conditions, water table, load and layout at no charge.
02. Design & quote
We size the system to your property and issue a clear written price.
03. Install
Excavation, filtration media, chambers and pipework by our team.
04. Commission & hand over
Tested, commissioned and handed over with maintenance guidance.
Frequently asked questions.
A soakaway simply lets wastewater seep into the ground and clogs over time, especially in clay. The Sisal Biomechanical Drainage System combines mechanical filtration with biological treatment and engineered hydraulic flow, so it treats the wastewater and resists clogging — lasting far longer and performing in difficult soils.
Yes. Poor performance in clayey and waterlogged soils is exactly the problem the SBDS was developed to solve.
Wastewater from kitchens, bathrooms and laundry, plus treated effluent from septic-tank or biofil-toilet systems. It suits residential, commercial and institutional developments.
Less than a conventional soakaway. The engineered design reduces clogging and extends service life; we hand over with maintenance guidance specific to your installation.
Yes. We assess the site and advise on integrating the SBDS with your existing plumbing and sanitation.
Solve your drainage problem properly.
Free site assessment and written quote — no obligation.