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Having had problems with pump and circulation in general ... in spite of what was a supposedly thorough powerflush by BG prior to fitting a new boiler .... I decided that I'd need to do something myself. As such I loaded this into the system and then systematically flushed individual rads using the normal circulating pump and a magfilter I'd installed a couple of years back. I was surprised at just how much debris that shifted with the X400 ... and how much better the system now runs.
I aim to repeat in a couple of weeks to clear any residual but the results are far superior to what I got from the original power flush .... at a fraction of the cost.
So, yes, I would definitely recommend and will buy again as I intend to log it as an annual PM task.