BG tend to do a powerflush as a matter of course - Don't get me wrong a properly performed powerflush is excellent and it certainly works well and should leave the system nice and clean, it just isn't needed in a lot of cases IMHO and usually adds a significant costs too and the better quality hardware isn't cheap either.
It does suit BG timescales for a system install though and of course it does mean they can add that not insignificant wedge onto the bill.
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