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Individual Septic Tanks (IST) 6–30 PE
Page last updated: October 2, 2026
Mui Fatt Individual Septic Tanks (IST) are decentralized wastewater treatment systems designed for residential and small commercial applications with population-equivalent requirements from 6 to 30 PE. The range includes PE Bio-Filter Septic Tanks manufactured from polyethylene using rotomoulding and FRP Bio-Filter Septic Tanks manufactured from Fiberglass Reinforced Plastic (FRP). The systems provide passive anaerobic treatment without mechanical power or electrical blowers.
Individual Septic Tanks for On-Site Sewage Treatment
Individual Septic Tanks (IST) provide on-site sewage treatment for properties that require an alternative to connection to a centralized municipal sewer network. Mui Fatt’s IST range covers population-equivalent requirements from 6 PE to 30 PE and includes both polyethylene and FRP Bio-Filter septic tank systems.
The systems are designed for applications such as landed residential homes, rural estates, detached villas and isolated commercial properties where on-site sewage treatment is required.
Mui Fatt Individual Septic Tank Product Lines
The IST range is available in two main Bio-Filter configurations:
| Product Line | Material | Application Range |
|---|---|---|
| PE Bio-Filter Septic Tank Series | Polyethylene (PE) | 6–18 PE |
| FRP Bio-Filter Septic Tank Series | Fiberglass Reinforced Plastic (FRP) | 8–30 PE |
Population Equivalent (PE) Sizing
The required Population Equivalent (PE) is determined based on the expected wastewater load from the property and its occupants. The sizing basis is:
| Source | PE Basis |
|---|---|
| House | 5 PE per house |
| Factory worker | 0.3 PE per worker |
| Office | 0.03 PE per m² of floor area |
Worked Example
For a property with 1 house, 10 factory workers and an office area of 100 m²:
- 1 house × 5 PE = 5 PE
- 10 factory workers × 0.3 PE = 3 PE
- 100 m² office × 0.03 PE/m² = 3 PE
Total PE = 5 + 3 + 3 = 11 PE.
The septic tank should therefore be selected based on the calculated Population Equivalent and the available model sizes for the applicable PE Bio-Filter or FRP Bio-Filter series.
How the Bio-Filter Septic Tank System Works
The Bio-Filter septic tank is a passive anaerobic wastewater treatment system with two main compartments: a settling chamber and a bio-media filter chamber. Wastewater flows through the system by gravity, without mechanical power or electrical blowers.
Primary Settlement
Incoming sewage first enters the settling chamber, where heavier solids settle and initial separation of solids from the wastewater takes place.
Anaerobic Bio-Filter Treatment
Wastewater then passes through the bio-media filter chamber, where high-surface-area bio-filter media supports biological treatment as the wastewater flows through the filter.
Final Discharge
After passing through the treatment process, the treated effluent exits the system through the outlet. The system operates by gravity without mechanical pumps or electrical blowers.
PE Bio-Filter Septic Tank Series
The PE Bio-Filter Septic Tank Series provides a polyethylene option for Individual Septic Tank applications. The tanks are manufactured using rotomoulding and are available in different model configurations and capacities for different PE requirements.
The registered PE septic tank models include vertical and horizontal cylindrical configurations. The applicable SPAN registration identifies the products as polyethylene (PE) pre-fabricated septic tanks and references MS 2441-1:2012.
PE Bio-Filter Septic Tank Model Specifications
The PE Bio-Filter Septic Tank Series includes horizontal and vertical cylindrical models covering population-equivalent requirements from 6 PE to 18 PE. The catalogue specifies the following model configurations and dimensions.
| Model | PE Rating | Type | Diameter | Length | Height H1 | Water Level H2 | Pipe Size |
|---|---|---|---|---|---|---|---|
| MFR2-PE | 8 PE | Horizontal | 1,200 mm | 2,060 mm | 1,200 mm | 950 mm | 100 mm |
| MF6-PE | 6 PE | Vertical | 1,450 mm | N/A | 1,530 mm | 1,240 mm | 100 mm |
| MF2-PE | 8 PE | Vertical | 1,440 mm | N/A | 1,910 mm | 1,610 mm | 100 mm |
| MF3A-PE | 10 PE | Vertical | 1,645 mm | N/A | 1,870 mm | 1,535 mm | 100 mm |
| MF12-PE | 12 PE | Vertical | 1,585 mm | N/A | 2,240 mm | 1,950 mm | 100 mm |
| MF3-PE | 15 PE | Vertical | 1,900 mm | N/A | 2,100 mm | 1,800 mm | 100 mm |
| MF18-PE | 18 PE | Vertical | 1,910 mm | N/A | 2,460 mm | 2,120 mm | 100 mm |
Dimensions are in millimetres. H1 refers to the tank height and H2 refers to the water level shown in the manufacturer's catalogue.
FRP Bio-Filter Septic Tank Series
The FRP Bio-Filter Septic Tank Series is manufactured from Fiberglass Reinforced Plastic (FRP) and provides an alternative construction for Individual Septic Tank applications.
The FRP range includes vertical and horizontal cylindrical prefabricated septic tank models. Registered models include MF2-FRP, MFR2-FRP, MF3-FRP, MFR3-FRP, MF20-FRP, MFR24-FRP and MFR30-FRP.
The FRP septic tanks are manufactured in accordance with MS 2441-1:2012 and are covered by SIRIM QAS International product certification.
FRP Bio-Filter Septic Tank Model Specifications
The FRP Bio-Filter Septic Tank Series includes vertical and horizontal cylindrical models covering population-equivalent requirements from 8 PE to 30 PE. The catalogue specifies the following model configurations and dimensions.
| Model | PE Rating | Type | Diameter | Length | Height H1 | Water Level H2 | Pipe Size |
|---|---|---|---|---|---|---|---|
| MF2-FRP | 8 PE | Vertical | 1,520 mm | N/A | 1,650 mm | 1,350 mm | 150 mm |
| MFR2-FRP | 8 PE | Horizontal | 1,520 mm | 1,565 mm | 1,620 mm | 1,220 mm | 150 mm |
| MF3-FRP | 15 PE | Vertical | 1,800 mm | N/A | 2,100 mm | 1,800 mm | 150 mm |
| MFR3-FRP | 15 PE | Horizontal | 1,800 mm | 2,020 mm | 1,900 mm | 1,500 mm | 150 mm |
| MF20-FRP | 20 PE | Vertical | 2,000 mm | N/A | 2,300 mm | 2,000 mm | 150 mm |
| MFR24-FRP | 28 PE | Horizontal | 2,000 mm | 3,000 mm | 2,100 mm | 1,700 mm | 150 mm |
| MFR30-FRP | 30 PE | Horizontal | 2,000 mm | 3,500 mm | 2,100 mm | 1,700 mm | 150 mm |
Dimensions are in millimetres. H1 refers to the tank height and H2 refers to the water level shown in the manufacturer's catalogue.
Pipe sizes: PE Bio-Filter septic tanks use 100 mm inlet and outlet pipes, while FRP Bio-Filter septic tanks use 150 mm inlet and outlet pipes.
For projects requiring more than 30 PE, Mui Fatt offers Small Sewage Treatment Systems from 40 to 150 PE .
Septic Tank Standards and Registration
Mui Fatt's Individual Septic Tank systems are based on MS 2441-1:2012, the applicable Malaysian Standard referenced for the septic tank products.
The PE and FRP septic tank product ranges have applicable SIRIM QAS certification and SPAN registration. The SPAN documentation identifies the septic tank products under the treatment-system category and references MS 2441-1:2012.
For projects requiring individual sewage treatment systems, Mui Fatt can provide product information and technical documentation for project and submission requirements.
Applications for Individual Septic Tanks
Mui Fatt Individual Septic Tanks are designed for on-site wastewater treatment applications where properties are not connected to centralized municipal sewer networks.
- Terrace houses requiring individual sewage treatment systems.
- Detached houses and bungalows in areas without centralized sewer connections.
- Semi-detached properties requiring an on-site wastewater treatment solution.
- Rural estates and properties located away from centralized municipal sewer networks.
- Small commercial blocks requiring on-site sewage treatment.
- Shop offices where an individual sewage treatment system is required.
- Communal facilities requiring an appropriately sized individual sewage treatment system.
Individual Septic Tank Installation
The same basic installation steps apply to both PE and FRP Bio-Filter septic tanks. Proper installation is important for the structural stability and operation of the tank.
- Prepare a suitable excavation and provide a properly levelled reinforced concrete base for the tank.
- Position the tank on the concrete base and secure it with the required anchoring.
- Connect the inlet and outlet pipes with the required pipe gradients.
- Backfill around the tank in a controlled manner using the specified backfilling material.
- Complete the manhole and access works according to the applicable installation requirements.
- Provide a 100 mm reinforced concrete slab over the tank where required by the installation arrangement.
The tank should be filled with water during installation before final backfilling and completion of the installation works.
Septic Tank Maintenance and Desludging
Regular inspection and desludging are important parts of septic tank maintenance. The Bio-Filter design provides access to the settling zone to facilitate desludging and maintenance.
The septic tank should be desludged once every 2 years. After each desludging, the tank should be refilled with water before returning it to normal operation.
Why Choose Mui Fatt Individual Septic Tanks?
- Suitable for properties without centralized sewer connections, providing an individual wastewater treatment solution for residential and small commercial projects.
- Site-specific sizing based on Population Equivalent (PE) and the expected wastewater loading of the property.
- Professional project support with product information and technical documentation for project requirements and submissions.
- IWK submission support is available to assist customers with applicable sewerage submission requirements.
- Installation guidance covering the required concrete base, anchoring, pipe gradients and backfilling requirements.
Frequently Asked Questions About Individual Septic Tanks
What is an Individual Septic Tank (IST)?
An Individual Septic Tank (IST) is a sewage treatment system designed to treat wastewater from an individual property or small facility where connection to a centralized municipal sewer network is not available or required.
What PE sizes are available for Individual Septic Tanks?
Mui Fatt’s Individual Septic Tank range includes the following model sizes:
- PE Bio-Filter: 6, 8, 10, 12, 15 and 18 PE
- FRP Bio-Filter: 8, 15, 20, 28 and 30 PE
What materials are available for Mui Fatt septic tanks?
The Individual Septic Tank range includes PE Bio-Filter Septic Tanks manufactured from polyethylene and FRP Bio-Filter Septic Tanks manufactured from Fiberglass Reinforced Plastic (FRP).
What is the warranty for Mui Fatt Individual Septic Tanks?
Mui Fatt Individual Septic Tanks come with a 5-year warranty against manufacturing defects, subject to the applicable warranty terms and conditions.
What type of effluent does the Bio-Filter septic tank produce?
The Bio-Filter septic tank is designed to produce Standard B effluent, subject to proper installation, operation and maintenance.
Does Mui Fatt provide septic tank installation?
Mui Fatt supplies the septic tank system but does not provide installation services. Installation should be carried out by the appointed contractor in accordance with the manufacturer's requirements and applicable project specifications.
Does Mui Fatt provide IWK submission services?
Yes. Mui Fatt offers IWK submission services to assist customers with the applicable sewerage submission requirements.
How does a Bio-Filter septic tank work?
The Bio-Filter system uses passive anaerobic treatment. Wastewater passes through the treatment stages by gravity, including settlement and biological filtration through high-surface-area bio-filter media, before final discharge.
Does the Bio-Filter septic tank require electricity?
No. The Bio-Filter system is designed for gravity-fed passive operation and does not require mechanical power or electrical blowers for the treatment process.
What standard do the septic tanks comply with?
The applicable Individual Septic Tank products are manufactured in accordance with MS 2441-1:2012, with applicable SIRIM QAS International product certification.
Are Mui Fatt septic tanks registered with SPAN?
Yes. The applicable PE and FRP septic tank products are registered with SPAN under the relevant product registration certificates. The applicable registration documentation identifies the products under the septic tank treatment-system category.
What properties are suitable for an Individual Septic Tank?
Individual Septic Tanks are suitable for applications such as landed residential properties, rural estates, detached villas, small commercial blocks, shop offices and communal facilities requiring on-site wastewater treatment.
What is the difference between PE and FRP septic tanks?
PE Bio-Filter septic tanks cover 6–18 PE and use 100 mm inlet and outlet pipes, while FRP Bio-Filter septic tanks cover 8–30 PE and use 150 mm inlet and outlet pipes. FRP septic tanks generally cost more than PE models. Both PE and FRP systems are suitable for applications in coastal areas and areas with high water tables, subject to the applicable installation requirements.
Can the septic tank be installed underground?
Yes. The septic tank is installed underground in a prepared pit on a reinforced concrete base, with proper anchoring, backfilling and pipe gradients according to the applicable installation requirements.
How should an Individual Septic Tank be installed?
Installation requires a suitable reinforced concrete base, proper anchoring, correct inlet and outlet gradients, controlled backfilling and appropriate manhole construction. Installation should follow the manufacturer's instructions for the selected tank.
How is a septic tank maintained?
The septic tank should be desludged once every 2 years. After each desludging, the tank should be refilled with water before returning it to normal operation.
Can Mui Fatt provide technical documents for a septic tank project?
Yes. Product and technical documentation can be provided for project requirements, including information needed for septic tank design, installation and applicable submission requirements.
Technical information reviewed by Danny Ng Shin Lai, Director & Lead Composite Technical Specialist at Mui Fatt Marketing Sdn Bhd. Danny studied Materials Science and Engineering at the University of California, Berkeley, graduating with the Class of 2012. He supports technical design, composite fabrication standards, engineering requirements and technical compliance for the company’s product range. View Danny Ng Shin Lai on LinkedIn .
Request an Individual Septic Tank Quotation
If you need an Individual Septic Tank for a residential, rural or small commercial project, Mui Fatt can help identify the appropriate PE rating and tank configuration based on the expected wastewater requirements and site conditions.
Contact Mui Fatt Marketing Sdn Bhd for product information, technical specifications, project requirements and quotation.
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