How effective is Fernox F8 and F1

1 Mar 2016
Reaction score
United Kingdom
Could I please have some comments from informed people who have used the F8 product to clean out dirt and sludge in a central heating system (without a power flush) by leaving it in there for a week or two at most before emptying it three times and also using the F1 inhibitor?

Is it possible to unblock a heat exchanger which is clogging up?
Sponsored Links
Power flush or any chemicals wont clear a blockage, they can clear a partial blockage but need a flow to work, if it is actually blocked it wont do anything
  • Thanks
Reactions: CBW
So the only solution is to replace the radiator or the heat exchanger if those are the items blocked?

I would have thought that a sufficiently aggressive power flush would clean it out.
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local