cardiffrob
Member
- Messages
- 1,530
- Location
- Wales, Llantwit Major.
Hello.
I replaced the heat exchanger in our boiler about 2 years ago and gave it a good clean out and flush. I noticed last week that there was a little layer of muck in the top tank (open system) and put some Fernox cleaner in before a flush today.
Is this limescale clag or ali corrosion? I wondered if I was seeing the leftovers from the previous blocked exchanger or something newly developed.
I've added a mug from a pile of XXXX to the top of the pile of XXXX out of the header tank.
I replaced the heat exchanger in our boiler about 2 years ago and gave it a good clean out and flush. I noticed last week that there was a little layer of muck in the top tank (open system) and put some Fernox cleaner in before a flush today.
Is this limescale clag or ali corrosion? I wondered if I was seeing the leftovers from the previous blocked exchanger or something newly developed.
I've added a mug from a pile of XXXX to the top of the pile of XXXX out of the header tank.