Rated 5 out of 5Â by Woody73 Reliable brand name
Sentinel X400 is recommended by Potterton and many other boiler manufacturers, easy to use and suitable for all types of boiler and pipe work.
23 Jul 2014
Rated 5 out of 5Â by PracticalLawyer Recommended by plumber
This sentinel 400 was recommended to me by the heating engineer who had come out to replace a broken boiler pump. I was advised that there was too much rubbish (he didn't actually use that word!) in my heating system.
It was simple to administer and I now look forward to it doing its job in sorting out my sludge!
2 May 2014
Rated 5 out of 5Â by Rayzor Give it time
Left this product in systen for two weeks and it made a marked improvement to heating system. I gave cool spots in radiators a few taps with rubber mallet to help loosen sludge and after a week they had gone.When I flushed sytem out there was a good amount of black sludge came out. Just give it time.
29 Sep 2013
Rated 5 out of 5Â by RIck100 De-sludged!
We had a noisy boiler, Our plumber fitted a new pump and suggested we de-sludge. I am a bit sceptical about such things but thought I would give it a try and bought two bottles of X400. With trepidation, we drained some water off, poured it in and crossed our fingers. It's 3 weeks since we put it in and the system needs draining down again but it's worked a treat. It took a few days but the boiler is now unbelievably silent so I'll be following up with X100 & X200 to complete the job.
27 Apr 2013