SO4 | Chloride-Free Potash Supplier | High Purity SOP

About us

We deliver premium SOP sustainably, from Western Australia to the world.

SO4 combines innovation, sustainability, and ethical practice to secure global food supply from the heart of Western Australia.

About SO4

products

We responsibly extract hypersaline brine and convert it into high-quality SOP to support global food production.

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What we do

Process & Projects

Brine Abstraction

At Lake Way, SO4 extracts and transports hypersaline brine through an integrated system of bores, trenches, and storage, ensuring a steady supply for potassium sulphate production.

Solar Evaporation Ponds

SO4’s expanding pond system concentrates and crystallises brine salts to produce a consistent feed for premium SOP.

Process Plant

Our Process Plant refines harvested salts into exceptionally pure SOP by carefully separating unwanted minerals through advanced treatment loops.

How we do it

sustainability

Respecting nature, enabling growth.

We deliver innovative, responsible solutions that meet today’s food needs while preserving resources for the future.

Native Title

Community and Engagement

Environmental Management

careers

We’re building more than a mine — we’re building a legacy. Be part of history.

“Working at SO4 has allowed me to demonstrate skills and build on experiences that would have otherwise been overlooked in the conventional mining industry. The Technical Services team is made up of incredibly talented and diverse individuals who consistently come together to tackle complex challenges and develop effective solutions. A company is only as strong as its people, and SO4 is full of great people.”

Josh Thomson
Hydrogeologist

“Being from England and coming from a finance background, it’s been great working at SO4 for the past two years. It’s a completely different industry, which makes the work in People & Capability really interesting and varied – no two days are the same.”

Jess Fletcher
People & Capability
Talent Officer

“I'm thrilled to have joined the team at SO4! From the warm welcome by the staff both on site and in head office. The abundance of fascinating projects has kept me well busy in my time here so far, I’m loving it.”

Gianluca Coccetti
Senior Production
Process Engineer

"The challenges keep me interested and engaged. Working alongside talented individuals allows me to expand my knowledge in other aspects of the business."

Michael Fanio
Purchasing Lead

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Driven

Rooted

Impactful

Premium fertiliser.
Sustainably produced.

26.7888° S, 120.3551° E

We deliver premium SOP sustainably, from Western Australia to the world.

We responsibly extract hypersaline brine and convert it into high-quality SOP to support global food production.