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  GaryC, Flick's law is all well and good but relates only to diffusion whereas much of the water transit through the aquifer is due to percolation or flow through fractures in the chalk and other strata. The maximum concentration of chlorides is noted in Reg's article as 5000 mg/litre. A dessertspoon of salt contains about that amount of chloride. That's how much you salt the water when you cook pasta.
  
  From the various scholarly articles I have read, it's clear that the scientific community is by no means united. So it's hardly surprising that we don't have a consensus on here.
  
  Just reflect on the fact that if new drilling does pollute the aquifer, we shan't know for ten years and it will take another fifty years to fix. The key seems to be removal from the site of the saline waste water, as the cause of the pollution from coal mining was the brine lagoons. It's unlikely that test drilling per se will cause fresh pollution.

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