Rated 5 out of 5Â by RonOfH be patient
Our Glowworm HXI (now 6 years old, standard boiler, not combi, not sealed) had been gradually getting noisier over the last two years. I tried a couple of additives that made no difference, had engineers out time and time again, nobody could fix it.
As a last resort I used this stuff back in February, it took till late April for me to realise it had actually worked! So in some systems you need to be patient.
28 Apr 2016
Rated 5 out of 5Â by apsleyend Immediate improvement
I had no difficulty adding the liquid through the filling loop of my sealed system (search for 'fernox f2 instructions' and look at the videos for hints, tips and reassurance). No difficulty that is once Iâd revisited my local Screwfix branch because the first can I took away didnât have the plastic filling loop adaptor clipped onto the can top. Do check.
Job done and I restarted the heating system. The banging immediately started to build up but within a minute it had stopped! One week later Iâm occasionally aware of a much quieter rumbling.
Far less disruptive than the power flush Iâd been threatened with. And cheaper.
28 Jan 2016
Rated 4 out of 5Â by DIYMan66 It does work EVENTUALLY
Potterton Profile started kettling after 20 years. The pump also seemed to be nosier. Always used Fernox Inhibitor so I guessed it was scale build-up in the heat exchanger.
Added Fernox Boiler Silencer and ran for 2 hours. Initially was disappointed as kettling continued however after 3 months the kettling has almost been eliminated. The pump is quieter as well so I guess the flow is now no longer restricted.
Give it time and it will work.
17 Dec 2014
Rated 5 out of 5Â by Claudine WOW
We had what sounded like a drum kit in two of the rads in the house it was so loud every morning would wake me up. Within 10 mins of using this product there was no noise at all I was so sceptical this would work having drained the system countless times to no avail - amazed great product highly recommend and really easy to do (complete novice)
2 Dec 2014