I'm about to change a couple of radiators, and as water bled from the system is grey and cloudy I thought a flush would be in order. A few years ago I removed the rads and flushed them through with a hose, but in spite of using Fernox MB1 the system still isn't clean. I'm inclined to blame the three ancient cast iron radiators, one of which is about to go. Having read the threads about commercial power flush operations I can't justify the expense, and anyway things can't be too bad as none of the rads have cold spots. I can't be bothered to take the rads off again, but I intend to try Sentinel X400, filling up later using Sentinel X100. The house is a bungalow so there isn't much head for flushing and I wondered if I could use mains pressure. If I tee across from the mains supplying the CH header tank into the boiler supply pipe (would a non-return valve be sensible/ mandatory here?) via a cut-off tap of course, and insert a cut-off tap between my tee and the header tank, would this allow a stronger flush? Can anyone see any flaws in this plan? The system has 8 rads, Gloworm Space Saver, 15mm pipe.
Rob
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