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| SLUDGE, CAUSE / EFFECT Sludge is a 'mud' resulting from the reaction between the water in your system and the steel in the radiators which can build up over a period of time and cause circulation and flow problems. The following are some symptoms to watch out for, which may indicate your central heating system may have a sludge problem: • Some radiators are completely or partially cold • Radiators need frequent bleeding • Repeated pump failures/corrosion deposits in pump casing • Strange and unpleasant noises from the boiler. |
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