scott wrote:
>> I would imagine the fact that it doesn't corrode metal is a fact 
>> too... ;-)
> 
> So long as it's sealed there isn't (any significant) corrosion.  I 
> imagine the heating system you have at home has been working for several 
> years, probably several decades with water running round it the whole time.

Actually no, it was fitted about 3 years ago. ;-)

What I *have* observed is that the water inside such systems is always 
jet black, and usually stinks like hell...

-- 
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