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i am eisily confused,but learning. Thanks 4 reply Tickly, pump was replaced 10 weeks ago, set at speed 1 (summer no heating on) never had this problem, Gas man wants to spend all day flushing out! Trying this i hope will help move the sludge proved by his Magnet. My magnet proves something has...

central heating, water(warm\hot) returning to the small header tank, advised that the system needs cleaning. Used sentinal by dropping 2 heads of water to get it into system then topped up and running(3 days). water still overflowing(trickling)when either system running. BUT the system does...