• Polluted Runoff
  • Stormwater
    (with trash & debris)
  • Separation Chamber
    (water flows through trash & debris drop down)
  • Solid collection Sump
    (trash & debris)
  • Stormwater
    (water only)
  • Unpolluted Waterways

What is CDS?

The CDS technology offers an effective method of separating solids from liquids. Based on a surprisingly simple combination of non-blinding screens and flow management, Continuous Deflective Separation (CDS) is a non-powered, low maintenance alternative to traditional screening systems.

An engineered product that has harnessed complex hydrodynamic principles …
What is CDS … into a simple & cost-effective system that significantly reduces contamination of our waterways

Learn About CDS Technology:

Indirect CDS Screening Technology

Indirect CDS Screening Technology

Comparison between normal direct filter screen and CDS indirect screening technology
CDS - Direct Screening

Normal Direct Screening

With normal direct filter screening, particles impact directly on the screen and eventually cause blinding

CDS - Indirect Screening

Indirect CDS Screening Technology

With CDS indirect screening, particles sweep past screen which remains clear

CDS World-Class Technology

CDS World-Class Technology
CDS is the only non-blocking screening technology independently validated by world-class research organizations such as:
  • CSIRO - Commonwealth Scientific & Industrial Research Organization. More
  • CRCCH - Co-operative Research Centre for Catchment Hydrology.
  • UCLA - University of California Los Angeles. More

CDS Performance

Description Capture Rate
Gross Pollutants (> 5mm) 98%
Coarse Sediment (> 0.2mm) 90%
Suspended Solids (TSS) 70%
Total Phosphorus (TP) 30%
Total Nitrate (TN) Free Oil 95%

With longer retention time achieved using one single bigger unit CDS can achieve 3 to 4 LEED points as proven in Malaysia first LEED COLD Green Building SHELL 3 in Cyberjaya.

Methods Of Removal

These are the three methods of litter removal from the CDS unit. All methods involve a minimum of manual handling.
Eduction (Suction) Vacuum TruckEduction (Suction) Vacuum Truck
Removable Basket UnitRemovable Basket Unit
Materials Grab TruckMaterials Grab Truck

Litter Sump Maintenance

The litter basket is easily maintained using either of these methods:
  • Vacuum Suction
  • Installed Basket – Simply lift out pollutants with a crane
  • Grab/Clamshell - Using a clamshell type grab bucket
Vacuum & SuctionVacuum & Suction
Installed BasketInstalled Basket




CDS has been highly successful in removing pollutants from the stormwater system. Some high profile sites within Australia and overseas have used the technology to keep the waterways clear of litter, vegetation and other matter flowing through the stormwater systems.

Sewerage Overflows

Sewerage Overflows

Sewer overflows have polluted waterways around the world. CDS has developed a product that removes gross solids from sewer overflow locations. The gross solids are separated and returned to the sewerage system and the screened fluid is then diverted into the overflow line



The CDS technology has been of great use to the industrial sector. The indirect screening provides a non-blinding separation system for a number of processes. CDS has been involved in separating pollutants from cooling liquids, sediments from site runoff and washdown facilities.

Sizing Criteria

When sizing a CDS unit for a given site, the following things are taken into account:
  • Catchment Area
  • Catchment use and imperviousness leading to pollutant loadings
  • Flowrates for the 3 month event
  • Performance requirements of the approval authority
  • Desired cleaning method and frequency
  • Site constraints
  • Budget constraints
Download CDS Sizing Criteria Form

CDS Unit Selection

The table below provides a general guideline only for sizing a CDS unit. CDS have a team of staff of experienced engineers who can design a system specific to your requirements.

CDS Units: Key characteristics

CDS Model No Catchment Area

Pollution Storage in Sump

Underground Footprint

Ground Level Footprint Diameter

F0506 ≤ 1 0.50 1.0 x 1.0 0.9
P0708 ≤ 2 1.80 1.5 x 1.5 1.3
F0908 ≤ 4 2.65 1.5 x 1.5 1.3
F0912 ≤ 6 2.95 1.5 x 1.5 1.3
P1009 ≤ 8 3.35 2.0 x 2.0 1.3
P1012 ≤ 12 3.60 2.0 x 2.0 1.3
P1015 ≤ 18 3.80 2.0 x 2.0 1.3
P1512 ≤ 20 7.10 2.6 x 2.6 1.8
P2018 ≤ 45 19.00 3.5 x 3.5 2.3
P2028 ≤ 75 21.50 3.5 x 3.5 2.3
P3018 ≤ 100 28.50 6.5 x 6.5 3.5
P3024 ≤ 150 32.75 6.5 x 6.5 3.5
P3030 ≤ 200 37.00 6.5 x 6.5 3.5
C4527 200-250 58.50 8.0 x 8.0 5.0
TWIN ≤ 500 variable variable variable

  1. CDS Model Selection Table shall only be used for initial sizing. Actual CDS model shall be determined by detailed engineering. Please check with EcoClean Technology Sdn Bhd for your specific needs.
  2. Twin precast unit combination can be used to treat larger flows – detail on request

P Precast Concrete
F Fiberglass
C Cast-in-place

* Based on vacuum suction

  • P2018 Precast unit with screen diameter 2000mm and height 1800mm
  • F0912 a Fiberglass unit with screen diameter 900mm and height 1200mm

Other Specific Applications ( details on request )
  • CDS Surface / Rainwater filtration unit
  • CDS Sewer overflow unit (CSO)
  • CDS Stainless steel or FRP industrial separator
  • CDS Sewer mining process for reuse water
  • CDS Smart water (Class A re-use water)
  • CDS filternator media filtration system
  • EcoClean Ausdrain Stormwater System for rainwater harvesting, re-use, infiltration, on site detention and bio-remediation.
  • Ecoclean oil and grease trap.
  • EcoSac wastewater primary screening
  • Vacuum fluid evacuation system
  • CDS Hybrid Advanced Immobilised Cell Reactor Technology (India) for water / Wastewater Treatment.

Rapidly Expanding Global Reach

Rapidly Expanding Global Reach

In Malaysia

Department of Irrigation & Drainage
Urban Stormwater Management Manual for Malaysia
(Manual Saliran Mesra Alam Malaysia)

Volume 13
Treatment Control
Best Management Practices (BMPs)
Gross Pollutant Traps (GPTs)
“…taking into consideration the present problems faced by the nation such as flash flood, river pollution …”