I have seen plenty of ink black water in houses I have bought. Suggest
you get something to flush the system with and a corrosion inhibitor (or
whatever they call it in diy shops at present).
The last lot I did I had to leave the flusher in for a few weeks I
believe. Not sure whether you will have to run the system hot which
might not be ideal in the current warm weather.
It is probably very fine particles of black iron oxide (Fe3O4).
It is formed preferentially to "normal rust" when rusting occurs quickly
under water. It may be due to the presence of corrosion cells, pit
corrosion or an impressed current.
There is an easy way to test - take the liquid and pass it through a
very fine filter paper. Repeat. Allow the paper to dry. Apply a magnet.
Black iron oxide is magnetic and the paper will stick to a magnet.
The good news is that it doesn't expand and block pipes and tubes, as
normal rust will. The bad news is that it used to be metal... If it is
all coming from one spot, which is distinctly possible.. then it could
eat through a few mm of steel in next to no time..
No, or very old, corrosion inhibitor in the system, perhaps?
You think right,it is a form of corrosion but in most cases not a problem.
A chemistry geek friend did tell me once but all I recall is its a
combination of the copper reacting with the chlorine in the water,the iron
in the radiators,pump and valves and the cast iron of the boiler (if you
have a cast iron heat exchanger).
A good flushing with clear water and a dose of 'Fernox' or similar will soon
shift it but here's the kicker ..
some 'fernox' types turn the water Black.
One things for sure Keep it of the carpet its a b*^^*r to clean.
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