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i have tried other makes but this does the job every time also use f5 and f1 in all my boiler installes and fernox tf1 filter. if you run a bottle of f5 and f3 in the system for a day it will shift most of shit in the system then flush out with water then 2 bottles of f1 great stuff.
Verified purchase: Yes | Condition: New
Central heating system is more efficient after using fernox f1 and f3. It is definatly worth it
Verified purchase: Yes | Condition: New
The product is very good. far too expensive!!!
Verified purchase: Yes | Condition: New
hi drained water out the header tank put the furnox in notice staight away it has stopped the kettling niose from the boiler when switching the boiler pete
Verified purchase: Yes | Condition: New
Boiler silencer really amazing,the boiler is nearly silent in no time big A1thanks what a product.
Verified purchase: Yes | Condition: Pre-owned
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