We've been watching the debate about fluoride so long now that we've forgotten the chlorine debate.
Chlorine is a carcinogen, but we don't know at what level of addition to a water supply it becomes carcinogenic. This very recent study summary puts it well:
"The author concludes that the uncertainties surrounding possible health risks from chlorination DBPs appear not to be appreciated by many of those involved in drinking water regulation, production or research."
Doesn't really inspire confidence, does it?
We have seen several instances in recent years where drought conditions
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