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  1. D

    radiator flushing

    I'd be grateful if someone could please advise on this. I would like to flush a couple of radiators using a pressurised sludge remover. Do I have to remove the radiators before doing so - or can I simply apply the cleaning product through the radiator's air vents?
  2. D

    Grundfos UPS 15

    Thank you ChrisR. The pump seems to be working according to specs at setting #3.
  3. D

    Grundfos UPS 15

    Hi, I would like to check if my Grundfos UPS 15-50 is working ok. I have read many post related to this pump but none explained how to check or even clean a UPS 15-50 - Can anyone please advise?
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