Fernox Restorer question

[marksi]

I previously used Fernox Restorer for a week before flushing my HEP microbore central heating system. I still have what I believe is gunge in the system due to it not being looked after before I moved into the house. Is it worth while or advisable to use Fernox Restorer for, say, a month before flushing again or is it a waste of time?

 

[ChrisR]

before flushing

Fill and empty isn't enough on clogged microbore. Next, try a pump or the mains. If there's no circulation then the chems weren't getting around.

Next more aggressive chemical is fernox ds-40.

see ref section