Help with brown DHW prob

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Evening All.
Apologies if I don't get the terminology right.
Thinking the brownish specks of gunge stuff coming from my hot water taps was due to the thin layer of gunge on the bottom of my plastic header tank in the loft I drained and cleaned the tank and drained the indirect hot water cylinder in the airing cupboard below, but while the gunge particles have largely gone the tap water is brown in colour.
Cold water is fine.
Boiler is a Worcester Danesmoor 12/14 serviced three months ago. C/H is a sealed system which runs fine.
Could the prob be the cylinder and if so what can go wrong with these internally to cause this?

Any tips or info greatly appreciated.
 
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Thanks for your reply rochdalegas.
Are there any internal parts of the copper cylinder that can corrode causing contamination of water? Cylinder is about 11 years old.
 
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. Unless the coils gone (unlikely) there shouldnt be much chance of any contamination its basically just copper. When cleaning header tank any crud/sediment will have been disturbed and will have to work through system couple of baths and it should be running clear again. Also make sure lids back on tight in loft
 

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