How effective is Fernox F8 and F1

[Mr_T25]

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?

 

[ianmcd]

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

 

[Mr_T25]

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.

 

[CBW]

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

As per @ianmcd, if it’s a solid blockage, no, only option is to replace affected areas/pipes.

 

[ianmcd]

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

nope if blocked it has to be manually cleared or section cut out