Is Black Sludge Destroying Your Boiler?   Restore Your Heating Efficiency with a Magnacleanse Flush   If you are experiencing any of the following issues, your central heating system is likely choking on magnetite (black iron rusty sludge): Cold spots at the bottom of your radiators Loud, clanking “kettle” noises coming from your boiler Spitting … Continue reading Expert Magnacleanse Flush | Remove Radiator Sludge