PumperDump is the Solution to Pollution | The Responsible Choice

Our previous blogs explored the importance of effective concrete washout management to prevent damage to the environment. Today, we’re going to take a closer look at both the environmental impact of concrete washout as well as what makes PumperDump the responsible choice for your construction projects. It goes without saying, concrete remains one of the most widely used substances in construction projects in the world. Undeniably, it’s one of the most commonly made materials on the planet, and the demand for concrete is astronomical. As the population increases and cities expand, the demand for concrete only increases. The prevalence for concrete is one thing, but it is not the whole story. It’s also the case that the materials which make up concrete can be quite hazardous. Is concrete washout really that bad for the environment? It’s reasonable to wonder if all the racket made over concrete washout is all that justified. After all, concrete structures can be found far and wide, and they don’t seem to be harming anything. Is this perhaps just a case of the NSW Environment Protection Authority (EPA) being overly-cautious and simply extending its reach beyond where it belongs? In short – NO. Concrete washout really is that harmful to the environment. Sure, concrete structures are everywhere. Once concrete dries, it becomes a stock-still substance that no longer poses a threat. Before that, the concrete mixture – and the water that was used in it (not excluding the water that was used to clean off the tools and trucks) – is corrosive. This material contains, grout, plaster, cement, mortar, stucco and other materials that contain harmful chemicals. The danger arises from these materials leaking into local water sources. As previously mentioned, concrete washout water has a toxicity level greater than ammonia and near the same pH level as chlorine bleach. It’s obvious as to why PumperDump tries so hard to prevent these substances from reaching our local water systems. What can we do about concrete washout? So now that it is evident that concrete washout is permissibly harmful to ecosystems, including our waterways. We’ve established that the regulations and precautions implemented by the NSW Environment Protection Authority (EPA) are not mere overreactions. What now? What can be done about concrete washout? Good news, there are several ways to approach concrete washout. An approach to concrete washout that used to be very popular was washout pits and washout bags. We’ve discussed before why these “solutions” are a thing of the past. There are many risks – both environmentally and financially – that come from choosing either washout pits or washout bags. We do not recommend it. You simply do not want to make use of inefficient washout systems. Doing so risks:
  • Contaminating lakes and other swimming areas with high amounts of zinc and iron, which have proven to cause diabetes, cancer, skin irritation and other adverse side effects
  • Exposing fresh waterway to corrosive, caustic concrete washout water and materials that may result in all kinds of damage to ecosystems
  • Allowing calcium, magnesium oxide, and calcium – conventional ingredients in ready-mix concrete – to infiltrate our soil systems
What’s the responsible option PumperDump offers alternatives to the inefficient washout systems. We have brought together innovative technology, patented concrete washout separation units and blowback units, a dedication to efficient and quality services, and a passion for ethical environmental practices to bring the industry the best concrete washout solutions. All in all, we understand the importance of needing to tackle construction projects affordably and efficiently, whilst also maintaining ethical environment practices. PumperDump is the responsible choice. We are your solution to washout pollution. Get in contact with one of our concrete washout solution specialists at info@pumperdump.com.au or by using the PumperDump App (App Store) (Google Play)
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GBCA Members | Sustainability in the Sydney Building and Construction Industry

PumperDump is proud to be acknowledged becoming a member of the Green Building Council of Australia. Our membership demonstrates our commitment to “the sustainable transformation of the built environment”. PumperDump’s core vision aligns with the GBCA in being able to proudly and ethically recycle 100% of all concrete waste and washout water resulting from construction activity, providing a sustainable and zero emissions future for our construction clients as well as for our industry. pumperdump-5M3 truck This is an association with Australia’s sustainability leaders who are committed to:
  • Supporting the creation of buildings and other infrastructure that are environmentally responsible and result in sustainable, efficient, profitable and healthy places for communities to live and work in.
  • Fostering a strong bind amongst peers and associates in the building, design, construction, and sustainable operations industries;
  • Encouraging the development and promotion of sustainable communities and environmentally responsible building practices;
  • Leading market transformation in sustainability and campaigning for the wider recognition of environmentally responsible buildings and practices;
  • Supporting and encouraging educational and research programs aimed at raising the knowledge and skill base of green building practitioners;
  • Actively aligning with relevant publicly funded research to the practice/market requirements for innovation and development in green building implementation;
  • Participating in public debate on environmental issues within the building industry;
  • Supporting the campaigning and soliciting of funds to be applied towards the GBCA’s objectives;
  • Acting with integrity, due care, and in a manner that upholds the reputation of the works and objectives of the GBCA and Green Star rating tools, its officers and employees.
We are pleased to be joining some of the industry’s most influential players on the Green Building Council of Australia register. Below are some of PumperDump’s clients who too are accredited members of the GBCA. Read below some of the exciting developments these companies are currently involved in around Sydney. ADCO Constructions With a national presence across Australia for nearly 50 years, ADCO Construction is one of the oldest and most established construction companies in Australia. A company committed to delivering quality to their clients, ADCO Constructions has managed to build a legacy amongst the industry – with over 3500 projects, valued in excess of $14 billion. Amongst their roaring success, ADCO is also a proud member of the Green Building Council of Australia and remain committed to the success and increased adoption of sustainable construction practices. Some of ADCO Construction’s recent Sydney projects include being the building partner for the next Property Industry Foundation (PIF) House in Sydney, which will give five homeless youth a safe and secure place to live. Hutchinson Builders Established in 1912, Hutchinson Builders is one of Australia’s largest privately-owned building and construction companies. Hutchinson Builders have transformed into a dynamic and diverse construction company, delivering sophisticated projects across a comprehensive portfolio. With 300+ projects built annually, “Hutchies” was able to generate a $2.87 billion turnover in 2020 alone. As members of the Green Building Council of Australia, they are leading the way in developing sustainable approaches and building services systems which address the key environmental criteria associated within the construction industry. With one in every 12 Green Star Rated building in Australia been built by Hutchinson Builders, they have delivered more than $2 billion Green Star Rated buildings. Hutchinson Builders have recently undertaken the first phase of truss installation for the Castle Residence project, working alongside United Development Sydney, bringing together high-end apartments with five-star luxury hotel services and amenities. Richard Crookes Constructions A private, family owned construction company that has been delivering projects as promised; safely and to the highest quality throughout NSW and ACT since 1976. Richard Crookes Constructions remains committed to continually improving the integration of sustainability into their working environment and business processes. RCC aims to portray a proactive role in contributing towards achieving sustainability where they have an influence in the delivery of construction. Whilst being members of the Green Building Council of Australia, Richard Crookes Constructions remains committed to following key objectives with regards to; Sustainable construction, reduced operational resources and sustainable reuse at end of service life. Current projects included the redevelopment of the Wyong Hospital in Hamlyn Terrace, NSW. PumperDump looks forward to pushing the sustainability agenda for all our projects for the benefit of our clients and the community. Want to know more, then get in touch #PumperDumpSolution #Construction #ConstructionIndustry #ConcreteRecycling #ContructionWaste #ConcreteSolutions #ConcreteManagement #ConcretePump #ConcreteWashout #ConcreteWasteManagement #C&DWaste #CircularEconomy #GreenBuilding #Pollution #NSW #NSWGovernment #Sustainability #Sydney #SydneyConstruction
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Introducing PumperDump’s New 5m3 Patent Pending Blowback Bin

Transforming industry experience, a wealth of knowledge and continuous system innovation for concrete pumping and concrete waste collection, PumperDump has been a player in the concrete pumping industry for years.

With the roaring success of the 2m3 (2 Cubic Meter) blowback bin which launched more than 10 years ago, it was not difficult to notice the gap in the market for something a little bigger. After months of planning and trialling, we are proud to introduce the new 5m3 (5 Cubic Meter) blowback bin to the streets of Sydney. 

Our latest innovation would not be possible without the collaboration of some important players in the industry.

We would like to thank Bincorp for the manufacturing of the bin, De Martin & Gasparini for assisting during the construction and for trialling the bin, and WATPAC for permitting this bin to be trialled on their site. We would also like to give thanks to Azzurri Concrete for their input during the construction.

This video shows the second blowback in the same bin without being emptied. PumperDump believes a modest improvement as such could save concrete pumping companies, builders and concrete suppliers money over the duration of a project.

How you ask?

While the delivery line is short and the bin is set in place, you will be able to get a couple of blowbacks into the same bin before it needs to be emptied. Depending on who is paying for the current blowback truck, this could reduce the blowback bill considerably. The bin is also ready at your disposal if there are any problems to occur during the pour – so no waiting for a blowback truck to arrive when time is crucial.

For builders, concreters or concrete suppliers who care about sustainability, there is far less truck movement, reducing the carbon usage associated with a blowout as well completely eliminating the use of plastic, strongly keeping to our policy of no plastic in any of the equipment or waste stream.

Lastly, for the concrete suppliers. There is no need to immediately cart concrete to your yard – reducing fuel consumption, turnaround time for the next load is much quicker, as well as reduced tipping or carting fees for the removal of waste concrete brought back to your yard.

So, depending on who you are in the industry there is a saving for you!

As this is a new system, we have a very limited number of 5m3 (5 Cubic Meter) bins. Nonetheless, we are more than happy to talk to any party interested in using a 5m3 on their current or new projects.
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Concrete Washout Guidelines

The disposal of slurry and waste concrete poses a potential risk of environmental harm if not managed appropriately. Creating and maintaining a designated wash-down area allows for contractors to correctly wash down equipment whilst reducing the risk of pollution to waters or land.

Managing concrete washout

Concrete wash water is alkaline (with a pH of around 12) and contains substantially high levels of Chromium, with the potential to harm and pollute land as well as seep into the ground and contaminate groundwater. Concrete washout material, if not managed effectively can increase the pH of surrounding waters in addition to posing potential harm to aquatic life and pollution to waters, including storm water.

Effective concrete washout facilities are used to contain liquids and concrete slurry when the chutes of concrete mixers and hoppers of concrete pumps are washed out after delivery to a site. These washout facilities are utilized to combine solids for simpler reuse or disposal and the prevention of contaminated runoff liquids. Solids that are wrongly disposed of can clog water drain pipes – resulting in flooding. Installing and utilising washout facilities not only assists in the prevention of water pollution but is also considered simply a matter of “good housekeeping” on construction sites. 

Location and management of washout areas

The following management measures should be considered to reduce the potential risks of concrete washout areas on the environment:

  • The washout area should be situated away from storm water drains, drainage lines and bodies of water.
  • The concrete washout area should be conveniently located for washing out equipment and clearly indicated.
  • All wash down water is to be contained within the designated watertight bund.
  • Concrete washout areas are typically not designed for the gathering of excess concrete. Excess concrete waste should be returned to the local batching plant for treatment and re-use, or placed in a site receptacle designated for concrete and masonry, and allowed to set.
  • To reduce the quantity of washout water produced, excess concrete should be scraped off the equipment before it is washed and placed in a site receptacle suitable for masonry and concrete.
  • A high pressure, low volume water spray nozzle is recommended to reduces excessive water use.


All concrete washout areas should be maintained and monitored to safeguard that they are fully functioning and have adequate storage capacity.

Monitoring should be undertaken as a minimum:

  • Weekly during dry weather
  • Prior to forecast rainfall events
  • During rainfall events
  • As soon as practical following the event of rainfall.

Set concrete should be removed to reinstate capacity to the washout area and prevent overflows.

Environmental Incidents

Lastly, any environmental incidences should be reported. An environmental incident emerges if concrete is washed out in an area other than the designated concrete washout area.

If you are interested in talking to the experts in concrete washout, get in contact with one of out concrete washout solution specialist at info@pumperdump.com.au or by using the PumperDump App (App Store) (Google Play) 

 Ref: Extracted from the NSW Government’s Concrete Washout Guidelines 

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Dealing with different types of concrete by-product

Advice from the CCAA. New South Wales has over 300 active concrete batching plants that produce numerous concrete by-products and wastes. The NSW legislation and regulations require that all operators remain committed to minimising the amount of new resources used during the production process, to ensure that as much material as possible is recycled or re-used, and any waste which cannot be re-used is disposed of appropriately and ethically.

More often than not, many concrete by-products can be re-used in the concrete batching process without breaching any of the existing environmental regulations. The CCAA has developed a document to provide guidance on the regulatory requirements for managing the four main concrete by-products. These products are specifically known as:

Concrete By-Product


1. Hardened Returned Concrete

Hardened Returned Concrete is concrete that has been returned to a concrete plant and has been cured and hardened. Hardened Returned Concrete contains the same properties as normal concrete and is largely free of contaminants, such as wood, cementitious materials, paper, steel reinforcement, plastic and brick. Once hardened, this concrete can be handled and stored with little risk of contaminated water runoff.

2. Concrete Wash Water

Concrete Wash Water has a high pH (near 12), which makes it highly alkaline, and it also has an excessive matter of suspended solids. Concrete Wash Water is the product produced from washing pumps, trucks, chutes and mixers or simply cleaning out and agitator bowl and hosing down the batch plant yard. 

3. Liquid Wash / Slurry

Liquid Wash Out is an unavoidable by-product of the concrete batching. The washout slurry descends to the bottom of settling ponds and tanks in concrete plants which makes it extremely challenging to pump and transfer. It is also an alkaline material which is exceptionally difficult to re-use in the concrete batching process as it is not a consistent product and it re-use presents numerous concrete performance and technical issues.

4. Solid  Wash Out

Solid Wash Out has the consistency of clay and is returned concrete that has been washed out and dried. It is a mixture of sand and aggregates from the original concrete, and contains hydrated lime and other cementitious materials which sources alkalinity. This material is generally taken out of washout pits, drained, dried, transported to quarries or recycling centres and recuperated for re-use.

Ref: Extracted from the NSW Government’s Concrete by-product Recycling and Disposal Industry Guidelines
Concrete Pump
How to Deal with Different Types of Concrete By-Product


General Exemptions Re-use

Hardened Returned Concrete can be crushed at facilities that have the applicable licences to form recovered aggregates. In this manner it can re-used in the concrete batching process, or applied to the land as engineering fill or as road base.

This material can be applied to road construction on private land if the following conditions are met:

  • Development consent for the development has been approved under the appropriate Environmental Planning Instrument.
  • The relevant waste is applied to land at the smallest degree necessary for the construction of a road.
  • It is to provide access (permanent or temporary) to a development approved by a local government.

The material being applied to the land must be sampled and tested, to ensure that it will pose marginal threat or harm to the environment.

Hardened Returned Concrete cannot be utilised for the following applications:

  • Quarry, mine and sand dredge rehabilitation
  • Dams
  • Back fill for voids
  • Utilised in reshaping land for agricultural purposes.

Re-use and Recycle

Concrete Wash Water is generally stored on-site at a concrete batch plant in settling ponds and is recycled into the concrete batching system. This process is advisable as it also reduces the requirement for clean mains water in the concrete batching process.


Liquid Wash Out is categorized as liquid waste material. As such, this waste is required to be transported by licensed contractors in specialized “sucker trucks”, designed for this task specific task, and disposed of at licenced facilities. 

Re-use and Recycle

Liquid Wash Out can be stored in settling ponds, which are stressed to keep the material in a state of suspension. The Liquid Wash Out or Slurry is maintained as such, in its liquid state. The water can then be pumped out and recycled back into the batching process, whilst leaving the majority of the cementitious alkalinity material in the settling pond.


If Liquid Wash Out cannot be kept in a state of suspension, the material will collect at the bottom of the settling pond, requiring it to be pumped out and disposed of at a licensed facility.


The final option for dealing with Liquid Wash Out is to change it from liquid waste into solid waste. This is an advisable process as it;

  • increases the number of disposal sites licensed to accept the waste
  • increases the ease of handling the waste
  • decreases transport costs and disposal fees.
One procedure applied for transforming the waste from a liquid to a solid, is to pump the slurry into dewatering tubes for geofabric bags.



Solid Wash Out does not require a licensed transported and does not entail tracking. Nonetheless, if the material is to be disposed of, it needs to be transported to a licensed facility. At the licensed facility, Solid Wash Out is either re-processed into sand and gravel, it is mixed with various other materials to either fill another product or become road-base.

If you are interested in optimising the way you deal with different types of concrete washout, get in contact with one of our experts for a more efficient and environmentally friendly solution at 1300 366 668 or by using the PumperDump App (App Store) (Google Play) 

Ref: Extracted from the NSW Government’s Concrete by-product Recycling and Disposal Industry Guidelines 

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