System Drain Down and Clean

8 Jan 2014
Reaction score
United Kingdom
So I recently did some work replacing rad valves, replacing 2 x rads with broken bleed valves and used some Fernox F3 for 1 week.

Since then I've drained down completely twice. And run the drain cock open and filling loop open for a while.

The Magnetic filter does have some extra gunk but not that much. The water draining to the drain was more or less sediment free. I guess it is hard to get the velocity to force it out of the 22mm backbone piping below drain cock level.

Anyway. Even after draining twice and flushing, there is a hint of golden colour and slight smell of the cleaner.

Is it ok to ad inhibitor now or more drain downs? Would Sentinel X800 do a lot more in a 24 hour hot cycle?

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