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TAKE a closer look at your bottle of "pure" water: it's probably sourced from the tap. Millions of unsuspecting customers are buying filtered tap water and boiled rainwater at massive mark-ups of more than 180,000 per cent.

Several manufacturers admit they fill their bottles from the Sydney Water mains after applying filtration and purification procedures - but they insist customers know their water is not sourced from a mineral spring, and are happy to pay for the convenience of having it in a plastic bottle.

The major brands that describe themselves as "spring" or "mineral" water are genuine natural spring water, including Mount Franklin, Fiji Water, Pump and the Coles and Woolworths homebrands.