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Thanks Muggles! I used wickes cleanser but the inhibitor was Sentinel. I have been looking at scale inhibitors....are these just magnets? Thanks again! also...Should I just add more inhibitor now or should I cleanse the system and then add more inhibitor?

I had a new central heating system installed about a year ago and pretty much from day one there have been problems. The installer, boiler manufacturer, and an independant plumber have all been out on more than one occasion, probably over 10 times! The boiler rep replaced the pump, heat...