Rock Bag Filter Units – The Smart Choice For Environmental & Infrastructure Protection
ROCK BAG FILTER UNITS®
Complete Scour & Erosion Protection Solutions
Designed. Manufactured. Placed. Verified.
Rock Bag Filter Units® provides complete scour, erosion and infrastructure protection solutions for civil, coastal, marine and offshore environments worldwide.
We manufacture high-performance Rock Bag Filter Units® and support projects from initial concept through to installation and final verification — combining project-specific CAD layouts, controlled manufacturing, specialist deployment systems, autonomous underwater release and Active 3D Sonar technology.
The result is more than an armour unit.
It is an integrated protection system designed to reduce installation complexity, improve placement control and provide a cost-effective alternative to conventional armour solutions.
More Than a Rock Bag
The value isn’t just in the bag. It’s in the system.
Every project is different.
Water depth, currents, scour conditions, infrastructure geometry, access, lifting capacity, seabed conditions and installation methodology can all influence the final solution.
That’s why we don’t simply manufacture Rock Bag Filter Units® and leave the rest to the client.
We can work alongside contractors, engineers and asset owners to develop the RBFU® arrangement, manufacture and deliver the units, provide specialist installation equipment, support controlled underwater placement and provide final as-built verification.
01 | MANUFACTURE
Manufactured for Performance
We don’t simply distribute Rock Bag Filter Units®.
We manufacture them.
Our Rock Bag Filter Units® are produced under controlled manufacturing ISO9001 requirements using specified materials, construction methods and quality-control procedures.
Product performance is supported by technical testing rather than marketing claims alone, with testing covering key characteristics relevant to demanding civil and marine applications around the world. Our 5 year test bed has been Australia, so no matter where your project is, Rock Bag Filter Units® will go the distance.
Built on Evidence. Not Assumptions.
02 | DESIGN
Project-Specific CAD Layouts
Rock Bag Filter Units® can be incorporated into project-specific CAD layouts to assist with unit configuration, placement geometry, quantities and installation planning.
From bridge pylons and seawalls to offshore foundations, revetments and subsea infrastructure, our CAD capability allows the proposed RBFU® arrangement to be visualised around the actual project geometry.
Concept Development • CAD Layouts • Unit Configuration • Quantity Planning • Placement Geometry
- Project Material’s CAD layouts support project development and installation planning. Final hydraulic, geotechnical and structural design acceptance remains with the appointed project engineer where applicable.
03 | DELIVER
Global Supply. Local Project Support.
Rock Bag Filter Units® supports civil, marine and environmental infrastructure projects internationally.
Our global network provides manufacturing and project delivery capability supported by distribution across the United Kingdom, Ireland, Netherlands and France, with offices in Australia, Ghana and the Czech Republic and broader international project experience.
Units can be supplied to suit the project delivery strategy, including integration with locally sourced rock where appropriate — reducing the need to transport the mass of the finished armour system over long distances.
04 | PLACE
Precision Underwater Placement
See it. Position it. Place it.
Underwater installation shouldn’t depend solely on diver visibility.
Rock Bag Filter Units® can combine our Self Release Hook with Active 3D Sonar technology to support controlled underwater placement in environments where depth, turbidity, currents or suspended sediment make conventional visual positioning difficult.
Active 3D Sonar provides a live three-dimensional view of the underwater environment, allowing the installation team to monitor the structure, seabed and placement area during deployment.
No Diver Required for Hook Release
Our purpose-developed Self Release Hook automatically releases the lifting ring once the Rock Bag Filter Unit is fully supported and the lifting load is removed.
This removes the need for a diver to manually disconnect each individual unit underwater during the placement sequence.
05 | VERIFY
Don’t Just Install It. Verify It.
Installation doesn’t have to be the end of the process.
Following placement, our Active 3D Sonar can be used to survey the completed works and provide an as-placed record of the installation.
The survey can support confirmation of coverage, identification of gaps or areas requiring adjustment, completion reporting and final engineering review.
Better Protection Shouldn’t Mean Higher Project Cost.
The true cost of an armour solution isn’t simply its purchase price.
It can include quarry materials, transport, heavy marine plant, lifting equipment, vessels, specialist personnel, divers, placement productivity, survey requirements, mobilisation and construction time.
Rock Bag Filter Units® provide an alternative approach.
By combining locally sourced rock, engineered containment, controlled placement and specialist installation technology, RBFU® solutions can offer substantial whole-of-project cost advantages compared with conventional protection methods in suitable applications.
Then four strong statements:
LESS MATERIAL TRANSPORT
Source suitable rock closer to the project rather than transporting finished heavy armour units long distances.
REDUCED DIVER DEPENDENCY
Autonomous underwater release removes the requirement for divers to manually disconnect individual units during placement.
CONTROLLED INSTALLATION
Active 3D Sonar supports placement where conventional underwater visibility is restricted.
VERIFIABLE RESULTS
As-built survey capability provides evidence of what has actually been installed.
The Value Isn’t Just in the Bag.
It’s in the System.
Have a scour, erosion or underwater protection problem?
Send us your drawings, bathymetry, site information or existing design. Our team can review the project and explore how Rock Bag Filter Units® could be incorporated into the proposed solution.
OUR SERVICES
We collaborate with clients around the world for design, supply and deployment success !
Great Ocean Road
Great Oceans Road – In order to protect a large beach front retaining wall from potential collapse, rock bags were deployed as an armouring system to dissipate wave energy and reduce scouring. Storm surge and inclement weather had compromised the retaining wall which was a safety concern with local council. Rock bags were chosen for their ability to be filled and craned into position protecting the wall and local community.
Cape Conran Victoria
Along the magnificent far eastern coastline of Victoria lies the beautiful township of Cape Conran. Contractors selected Rock Bags to create an innovative wave barrier in conjunction with coffer dam to protect a work area from tides and wave action while dismantling and rebuilding a jetty. Rock bags were prefilled and transported to site for rapid deployment and craned directly onto the sea floor to create the wall structure.
Bostock Reservoir
After the devastating floods in 2022, the Bostock Water Reservoir in regional Victoria suffered a major failure on the spillway. Though collaboration with engineers and Barwon Water Authority a plan was executed to repair the massive scour hole that formed when flood waters undermined the concrete plates. Rock Bags along with concrete were used to fill and stabilise the structure.
Noosa Shire QLD
Noosa Shire Council implements rock bags to protect a collapsing creek bank and exposed infrastructure after flood waters severely damaged the area. The rock bags were filled at a local quarry, transported to site and craned into position with ease and efficiency. The council successfully mitigated any further damage from future floods by armouring the creek bank and protecting exposed water pipes from costly repair or replacement.
West Brisbane QLD
The Bremer River located in South East Queensland is a tributary river to the larger Brisbane River. It meanders through the Scenic Rim, Ipswich and towards Brisbane. The area is prone to flooding therefore also prone to erosion and damage to infrastructure. Rock Bags were cleverly placed up the embankment which suffered erosion from a series of flood events. The area is now fully stabilized by Rock Bags and nature has taken over by re-vegetating over the entire site.
Port Macquarie NSW
After huge seas battered the East Coast of NSW, local council chose Rock Bag Filter Units to stabilise, reinstate and protect exposed sand dunes and storm water infrastructure. Given the sensitive location, HDPE bags were chosen to ensure maximum longevity to UV exposure and abrasion resistance given the likely hood of waves breaking against the rock armouring system. In 2025 large waves battered the area again with no scour or damage to the area protected by Rock Bag Filter Units.
Akosombo Ghana
The Akosombo dam, located in Ghana required a spillway redesign. The 50 year old the spillway failed to produce sufficient lift therefore created a gigantic scour hole undermining the spillway. As a “worlds first” design and installation, a significant retaining wall comprising 900 x 8 ton Rock Bag Filter Units was constructed under water with 20,000 cubic meters of back fill, progressively “built out” 200m across the dam. The project has drawn global attention for its novel design and rapid installation.
Central West NSW
Regular flooding in the central west areas of New South Wales saw local rivers scouring away embankments impacting local land whilst increased sediment flowed down stream. A number of sites required immediate remediation and Rock Bag Filter Units were the chosen armouring system for efficiency and safety. Our autonomous self release hook was utilsed on almost vertical embankments allowing the crane operator to place and release the rock bags with-out human intervention.
