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Richardthe3rd - Do you think two litres of Sentinel in a 100+ litre system is too much? I read that too little inhibitor can actually accelerate corrosion in the system. To complicate matters further, today another plumber told me that it is normal to get magnetite even after a few weeks in...

I've spoken to the plumber that did the installation and he did flush and put a cleaning chemical in first, followed by cold flush and then inhibitor. However, I calculated the water content of the system to be close to 100 litres, so I think it is possible that there is not enough inhibitor (1...

Tony - A friend did the install (BG contractor 15 years experience). He told me he was going to use something for neutralising the flux, I just didn't actually see him put it in. If he says he did then I'm inclined to believe him, but the black crud is still a problem. I wanted to check here...

Thanks 45yearsagasman, the pipework is copper. I think the installer did do a hot flush with a chemical to neutralize the flux, but I will check with him. Would a poorly balanced system lead to air in the radiators?

Hi, This is my first post here. I did try searching the forum, but could only find references to old systems so sorry if this has been covered already. I've recently had a completely new central heating system installed (all new pipes, rads and boiler). After one month of operation, I...