For the first time ever I have looked properly at my cold water tank. It has one inch of brown sludge at the bottom, what should I do. I assume this is the tank that provides the water hot/cold to everything except the main kitchen taps. (But is not involved in the radiators, that is in another tank in the loft ?). The water itself appears clear but it cannot be right for then to be brown sludge.
(I have also checked the feed/expansion tank used by the central heating, and this is looks murkier, but doesnt have an inch of sludge at the bottom)
I assume I have it the right way round, the cold-water tank has alot more connectins than the feed-expansion tank.
Where would It come from and how can I get rid of it ?