Fernox F3

[diycooper]

I usually leave this in for a week before flushing. I have read you an leave it in longer. If so does it do a better job and more important. Can it do any damage ?

Also will this clean the tubes on a Ecotec pro 28, or will they need physically cleaning ?

 

[cross thread]

if you are on about the rubber tubes on a vailliant they want replacing not cleaning,

 

[diycooper]

if you are on about the rubber tubes on a vailliant they want replacing not cleaning,

Ok, Can the Fernox F3 stay in longer than a week, if so will it make a difference .

 

[Twenty Four]

Fernox F3

 

[diycooper]

Fernox F3

This says 1 week but i am reading other people have left in longer for better results against fernox manual. I take it this would be a bad idea ?

It does state you may have to repeat for heavy sludged systems which suggests it could be left in longer.

 

[cross thread]

yes it can

 

[Twenty Four]

This says 1 week but i am reading other people have left in longer for better results against fernox manual. I take it this would be a bad idea ?

It does state you may have to repeat for heavy sludged systems which suggests it could be left in longer.

I'm sure someone here will contradict manufacturer's instructions having left it in longer without apparent issues.
Repeating a dose though doesn't suggest it can be left in any longer, as you would have flushed in between to know it needs re-dosing.