This is an example of what a MagnaClean Filter removes from your system. The filters stay attached to your heating system permanently and can be very easily removed and cleaned out on a yearly basis or more often if required. The powerful magnet removes virtually 100% of circulating sludge. This comes from iron oxide deposits in your central heating system and removing these can help keep your system operating at its best. Even a small amount of sludge in the system can dramatically decrease its efficiency, causing cold spots in your radiators and reduce the lifespan of your boiler.