In Australia, and many other countries worldwide, aluminium sulfate (alum) is the most commonly used coagulant as it is widely available and relatively cheap.
Australian sewers are being corroded partly because of an additive used in the drinking water treatment process. In some cases the lifetime of concrete pipes is being reduced by up to 90%.
But much of that corrosion could be reduced by a simple change in the chemicals used to treat the water, we report in a paper published today in Science.
http://theconversation.com/crumbling-sewers-are-linked-to-drinking-water-treatment-30398
And you thought drinking water was just pure water...so if it corrodes concrete, what is drinking water doing to our bodies?
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