I'm looking to replace radiator in our bathroom, the system hasnt been flushed in years. Am i ok to fit a new rad and stick in some X100 in (3 bed with 9 rads) and hold off using some x400 until i've finished decorating (in a few weeks) or should i remove rad stick the x400 in now and give it a couple of weeks to work then flush and fit new rad.
Also given what i've said about how long it is since last flush how much would you suggest using? 1 or 2 litres?
Also given what i've said about how long it is since last flush how much would you suggest using? 1 or 2 litres?
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