Overview of Filtration

Filtration is the process of removing suspended solids from water by passing the water through a permeable fabric or porous bed of materials. Groundwater is naturally filtered as it flows through porous layers of soil. Some contaminants pose a threat to human health, and filtration is one of the oldest and simplest methods of removing them.


Learn about our Scrufilter, a high-performance filtration solution, ideal for wastewater treatment with a focus on sustainability and efficiency.

LP Underdrain Blocks

Discover LP dual parallel underdrain blocks designed for a low opex and highly sustainable filters in drinking water treatment plants, offering durability, efficiency, and eco-conscious building solutions.

Submerged Aerated Filter

Experience our Submerged Aerated Filter, engineered for effective water and waste water treatment, combining high-performance filtration with environmental sustainability targeting ammonia pollution and high BOD.

Membrane System

Explore our advanced membrane systems for efficient water purification, ensuring eco-friendly solutions with cutting-edge technology.
How it works

Easy step

Streamlined solutions for simplified sustainability in every step.

Take a survey Location

Begin by surveying your location to assess the specific water treatment needs and environmental factors.

Estimate your budget Cost

Evaluate and calculate the estimated costs for your project, including all necessary equipment and services.

Project Work

Collaborate with our team to design, develop, and implement a comprehensive water treatment solution tailored to your requirements.

Launching & Testing

Deploy a prototype or supply and install your water treatment system, conduct thorough testing, and launch the full-scale system operation.

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Discover the solutions offered by Greendex

Ready to take the next step? Contact us today for a free quote and discover how our expert solutions can meet your water treatment needs. Our team is here to provide personalized guidance and support to help you achieve your goals.


Need help?

Our team is here to assist you with all your water treatment needs. Contact us today for our experts’ advice and personalized support.

Customer Support

For any inquiries or assistance, our dedicated support team is here to help you promptly and effectively. Reach out to us through our contact form or call us directly for personalized support.

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The compact SCRUFILTER® units from TEKNOFANGHI can be used in many applications of micro-filtration in order to reduce fine suspended solids from water down to 20 microns. The reduction of suspended solids is accompanied by a reduction in COD, BOD5, phosphorus, nitrates and other substances.

In the case of further treatment with UV for disinfection it is important to reduce the turbidity caused by suspended solids.

Teknofanghi – Scrufilter

Standard filters for SCRUFILTER are produced with supports in ABS and filter cloths in polyester. These can also be produced completely in stainless steel. The filter cloth is selected according to the requirements which can be 20 – 30 – 40 – 60 – 80 or 100 microns. On special request different filter sizes can be produced.

Typical Applications of Scrufilter:

  • Waste water treatment plants (improvement of discharge)
  • Waste water treatment plants (removal of phosphates)
  • Water recovery (food industry, textile, paper mill, etc.)
  • Beverage production plants
  • Fish-breeding farms
  • Filtration of surface water (river, lake, etc) and well water.

Providing water and wastewater treatment solutions for a sustainable future. Contact our Sales and Project Team today!​

TETRA LP Block – Underdrain Filtration

TETRA LP blocks are popular with plant owners for their low headloss, lightweight construction and easy installation either as a retrofit or for new filter underdrain applications. The easy-to-assemble TETRA underdrain filters ensure exceptional installation strength, integrity and maintenance-free life with no moving or wearing parts.

The underdrain filters feature the GroutGrip™ design, which helps to alleviate the buoyancy inherent in any plastic underdrain installation. Additionally, the wide, low-profile design requires that fewer blocks be installed to cover a filter floor. Therefore, fewer joints and less grout are needed.



Greendex has a broad range of filtration technologies ranging from Physical to Biological Treatment to treat BOD, COD, Turbidity of water and wastewater quality.

Air is distributed evenly across the entire filter bottom area to scour the media and to provide an air lift which, with the water, removes the released solids from the filter. This dual backwash action provides intense washing energy throughout the filter.

In gravity filters, the underdrain is one of the most important components contributing to overall system performance and operation.


Providing water and wastewater treatment solutions for a sustainable future. Contact our Sales and Project Team today!​

Submerged Aerated Filter

Ammonia Removal System

TETRA SAF™, a simple process for the biological oxidation of ammonia-nitrogen (NH3-N) and BOD for both municipal and industrial wastewaters. TETRA SAF offers exceptional performance, reliability, and operational and maintenance cost savings over competitive systems. TETRA SAF is an upflow,fixed-film biological reactor that uses coarse media requiring no backwashing. A robust and small footprint system, it can be used as either a secondary or tertiary treatment. When combined with primary and final settlement, TETRA SAF offers a complete high performance treatment process.


TETRA SAF is a simpler alternative to more complex treatments such as activated sludge and Biological Aerated Filters (BAF), which require more extensive operator input and process monitoring and control. The design encourages the growth of a robust biomass capable of consistently producing high quality effluents, even during large variations in hydraulic and biological loadings.

Ammonia and BOD can be removed in the same step or in separate reactors depending upon the wastewater treatment requirements. The biological reaction occurs in an aerobic environment. As the wastewater passes over the media, BOD and NH3-N are converted into biological solids. continuously released from the media bed. The solids are either removed via clarification or filtration depending upon system requirements.


Providing water and wastewater treatment solutions for a sustainable future. Contact our Sales and Project Team today!​

Membrane System

Greendex has the experience of design and built for different membrane system for water treatment. We offer Ultrafiltration, Nanofiltration and Reverse Osmosis Systems suitable for tap, brackish or seawater desalination needs to meet a variety of small to large municipal, commercial and industrial applications.

We also offer Denora UAT™ EDI electrodeionization system, ideally suited for polishing reverse osmosis (RO) permeate, replacing conventional mixed bed ion exchange systems by eliminating the need to store and handle hazardous chemicals used for resin regeneration and associated waste neutralization requirements. Systems are available with a maximum permeate flow rate of 2.2 m³/h – 104 m³/h or 10 GPM – 460 GPM.

Membrane Filtration

Bukit Barun UF

Bukit Barun UF

Greendex is the specialist sub-contractor for the Ultra Filtration membrane project for Bukit Barun drinking water treatment plant in Brunei. The project tested 10 million litres of water and proven that UF membranes can improve water quality, reduce chemical dependency, lower energy usage and improve public health. His Royal Highness Prince Hj Al-Muhtadee Billah and Senior Minister has graced the plant that was proven highly successful.


Providing water and wastewater treatment solutions for a sustainable future. Contact our Sales and Project Team today!​

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