Australian spring water can undergo various levels of natural filtration as it flows through the ground and rock formations before reaching the spring source. This natural filtration process can help remove impurities and particles from the water. However, the degree of natural filtration can vary depending on the specific geological characteristics of the spring's source.
Additionally, some spring water suppliers might choose to further filter their water to ensure its cleanliness and quality before bottling. Filtration methods can include processes such as micron filtration, activated carbon filtration, and other methods to remove any remaining impurities and particles.
If you're interested in knowing whether a specific brand of Australian spring water is filtered, I recommend checking the product label or reaching out to the water supplier for more information about their filtration processes. Many reputable spring water brands provide details about their sourcing, testing, and treatment methods on their labels or websites to inform consumers about the quality of their products.