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Desalination: a trusted and preferred water source

Each year about half of Perth’s drinking water supply comes from two existing seawater desalination plants in Kwinana and Binningup (in the State’s south-west). What is a seawater...Read more


Desalination: a trusted and preferred water source
Desalination: a trusted and preferred water source
Each year about half of Perth’s drinking water supply comes from two existing seawater desalination plants in Kwinana and Binningup (in the State’s south-west). What is a seawater desalination plant? Desalination is the removal of salt and impurities from groundwater or seawater to produce drinking quality water. Our desalination plants use a multi-step filtration process to remove dissolved materials including salt, chemicals and microorganisms. Seawater is pumped into the desalination plant from the ocean where it goes through an initial process called ultra filtration, which separates out all the large molecules and dissolved materials from the water. The next step is reverse osmosis where the water is forced under pressure through tubes that contain tightly wound membranes with microscopic pores which filter out the salt and other dissolved materials that are even smaller. Salt and other impurities, known as brine, removed from the water are then pumped back into the ocean through diffusers, which ensure it mixes quickly and thoroughly back into the sea. The resulting treated water is stored and then further treated before being supplied to our customers.