Sludge in CH heater tank

[Guzzles]

Hi,

I recently changed a radiator, so as the system was partially drained I topped up with inhibitor. Before adding Sentinel X100 & X200 I noticed that the header tank had dark 'gunge' (apologies no better word to describe it) around the waterline and in the bottom. I was surprised as I only cleaned the same type of gunge from the tank 2 years back during a CH flush before adding Sentinel X100 and X200. I thought it might be the pump being too fast, but it is on the second position feeding 13 rads.

Any views/thoughts/suggestions?

 

[wonderb0y]

2 options,

get it flushed by a proper firm should take a good few hours if done right.


or drain fully and add a full bottle of inhibitor, and see how you go. (cheaper option)

all rads will get gunked up after time.

 

[Lagerkhan]

That dark gunge is probably the last lot you put in
You have to put it in when tank/system is empty so as new water can send it around system.
I have seen header tanks full of what looks like an Octopus caused by unmixed inhibitor