Powerflush needed. Dirty water from a heating system. The dark, sludge-like substance is magnetite, a type of iron oxide that builds up over time from corrosion in the pipes and radiators. This gunk can cause serious problems for your central heating system, from cold spots on radiators to a noisy boiler, and can even lead to a complete breakdown. A power flush is a professional deep-cleaning process that circulates a powerful cleaning agent through your system to dislodge and remove this harmfu

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