Sludge builds up quietly for years, then shows up as cold radiators, noisy pipes and an expensive boiler failure.
Radiators cold at the bottom but hot at the top are the classic symptom. That is magnetite settling where the flow is slowest.
Banging, kettling or gurgling from the boiler means debris is restricting the heat exchanger and water is locally boiling.
Slow warm-up times across the whole house point to reduced circulation, not to an undersized boiler.
Dirty, dark water when you bleed a radiator is a direct sample of what is circulating through your boiler every day.
Repeated pump or valve failures are the expensive stage. By then the sludge has been abrasive for years.
A proper power flush includes chemical treatment, magnetic filtration and an inhibitor dose, with before-and-after readings you can keep for the warranty file.
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