Earlier this year, I replaced several old Danfoss TRVs on my system with Drayton RT-111 TRVs.
I took the opportunity to clean the system using Sentinel X800 (applied strictly in accordance wit the manufacturer’s instructions), and having flushed it twice, then added Sentinel X100 inhibitor to the final fill.
All has been working well since, and the boiler (an old Pottertton Netaheat 16 22 Electronic) has been running more quietly.
I had a look in the expansion tank today, and found that it was full of gunge (best I can describe it – a bit like the skin that forms on custard when it cools). I’ve included a couple of pictures.
I’m concerned that eventually this gunge may find its way down the cold feed and block the pipework (which is microbore, distributed through manifolds)
Anybody got any idea what this gunge may be, and why it has formed so soon after a thorough clean?
I took the opportunity to clean the system using Sentinel X800 (applied strictly in accordance wit the manufacturer’s instructions), and having flushed it twice, then added Sentinel X100 inhibitor to the final fill.
All has been working well since, and the boiler (an old Pottertton Netaheat 16 22 Electronic) has been running more quietly.
I had a look in the expansion tank today, and found that it was full of gunge (best I can describe it – a bit like the skin that forms on custard when it cools). I’ve included a couple of pictures.
I’m concerned that eventually this gunge may find its way down the cold feed and block the pipework (which is microbore, distributed through manifolds)
Anybody got any idea what this gunge may be, and why it has formed so soon after a thorough clean?