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Originally Posted by Dave Stones
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I noticed that today's paper described it as being filtered 3 times and then further purified by reverse osmosis. Reverse osmosis is used in modern lab systems for producing pure water. These systems have a fair number of stages. Speaking from memory, they would start of with a deioniser to get rid of most of the minerals, then there'd be reverse osmosis to highly purify it then probably something like 'polishing' with activated carbon to get rid of any trace organics left.
So I'd say that the water in the bottle is quite pure. However, I also noticed that they had to put back in all the magnesium, sodium, bicarbonate and sulphate that they'd gone to all the trouble to remove to get some taste back into the insipid brew that they'd taken all the trouble to produce!
If you want tap water that has probably had trace heavy metals and (possibly) trace organics taken out of it, then by all means buy it; but I'll guarantee that you're paying an arm and a leg for something not much better than tap water. Probably better to spend your money on a Brita filter or similar.
Nostalgia time When I was a young lad (come back here, you!), we purified water by distillation or, for the luxury version, double distillation. If your water was like liquid chalk, the elements would fur up completely by the end of the first day.