Freshwater shortages aren’t just a future worry – they’re happening now in Aotearoa and across the Pacific Islands. From drought-prone rural regions to isolated coastal and island communities, New Zealanders and Pasifika peoples are turning to desalination for support. It provides a safe, steady supply of drinking water. These systems have helped keep households running, supported local businesses, and provided relief for farmers when rainfall hasn’t been enough.
But desalination comes with a catch.
The clean water is only half the story. What’s left behind – desalination waste – will decide whether this technology is truly sustainable for New Zealand and Pasifika communities.
What Is Desalination Waste?
When seawater is desalinated, you end up with two streams: fresh, drinkable water and brine – seawater that’s become far more concentrated in salt.
In conventional plants, this brine isn’t just salty. It often contains traces of the chemicals needed to keep the system working, such as:
- Anti-scalants (to prevent mineral build-up)
- Chlorine (to disinfect)
- Coagulants (to capture impurities)
- pH adjusters (to protect equipment)
Because these chemicals are added continuously, the resulting brine is significantly more concentrated – both in salt and additives – than natural seawater.
Why Traditional Desalination Waste Is a Growing Concern in NZ & the Pacific Islands
Oceania is defined by its marine and freshwater ecosystems – from delicate coastal estuaries to aquifers that sustain agriculture. How desalination waste is managed matters enormously.
- In coastal sites, untreated brine sinks to the seabed, where it can create low-oxygen “dead zones” that harm fish, shellfish, and other marine life. That’s particularly concerning in regions where aquaculture and fisheries are vital to local economies.
- In inland or agricultural settings, brine discharged onto land can seep into groundwater or rivers, raising salinity levels and threatening crops. Soils may become less productive, and ecosystems that native plants and animals rely on can be disrupted.
With droughts predicted to intensify under climate change, this issue is only set to grow more urgent.
No Chemicals
Only manufacturer in the industry
100% Solar
Hybrid system, can be fully powered by solar energy
Can Desalination Be Truly Sustainable?
Yes – but only if waste is managed differently.
The Bluemont-distributed Elemental Water Makers (EWM) Solar Desalination System has been designed with this challenge at its core, making it a smarter fit for environmental standards and communities.
100% Chemical-Free Operation
Unlike conventional plants, EWM units use ZERO chemicals. Instead of relying on additives, membranes are flushed with a small portion of the system’s own fresh water output. This keeps operations clean while ensuring the brine contains only concentrated salt – not residues that could harm New Zealand’s and the Pacific Islands’ fragile coastal ecosystems.
Minimal Waste Output
EWM units recover more freshwater from each litre of seawater, meaning less brine is produced overall. They also use an energy recovery device to harness pressure from the brine stream, keeping operating energy down to around 3 kWh per cubic metre of water. That’s far lower than conventional systems, which often use 7–10 kWh – reducing both costs and environmental load.
100% Solar-Powered
Because EWM systems are designed to run on solar power, they avoid fossil fuel dependence and deliver zero operational emissions. This is particularly important as NZ and the Pacific Islands work to meet its climate commitments while building resilience against water scarcity.
The Bigger Picture: Water Without Compromise
As climate variability continues to impact rainfall patterns across both large and small islands, desalination will become increasingly important. But sustainability is about more than securing supply – it’s about protecting the land and sea that communities depend on.
Bluemont’s EWM Solar Desalination systems show it’s possible to achieve both:
- No chemicals in the waste stream
- Less brine to dispose of
- Zero carbon emissions from solar operation
Make the Right Choice – Avoid the Pitfalls of Desalination Waste
Desalination waste management isn’t just a side issue – it’s central to ensuring New Zealand’s and the Pacific Islands’ ecosystems remain healthy. With the many applications of EWM Solar Desalination System, communities can secure fresh, reliable water without passing on an environmental problem to the next generation.
Learn more by browsing our Water Desalination FAQs or get in touch today: info@bluemont.co.nz, or call: +64 (9) 872 2622