Particle noise in radiators?

[Unregistered]

Hi,

I have recently moved in to a house and found a very old bottle of inhibitor next to a very dirty expansion and top up reservoir in the loft. Bleeding the rads the water was filthy too.

So I drained some out of a rad and added 2 bottles of fernox f3 and left it for a week under normal operation.

After a week I drained down the system, cleaned out the tank then refilled 3 times, bled and ran for a short time in between too. The water was very dirty and yellow and now it is very clear and clean.

All is well and the system is working well except I have a noise like small particles in the radiators from when the pump starts until the system goes off (it also did this before) I have drain some out to see if it's particles but other than the odd very small dot nothing that I can see would make the noise of that frequency. I have bleed all rads and valves and there is not airin the system. I also added fernox inhibitor on the last fill.

Does anyone know what this would be? It's quite annoying hearing the tinkling, tink..... Tink.... Tink.

Thanks in advance, cheers

 

[Rickster123]

Please register and repost for an answer. Thanks.