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The Sentinel X400 High-Performance Cleaner is perfect for cleaning older systems. It features a non-acid formula that restores circulation in radiators and pipes. This cleaner efficiently removes build-up of magnetite sludge and eliminates cold spots in radiators, ensuring proper heat distribution. It is ideal for systems with circulation problems and prepares older systems for new component installations. The non-acidic nature of the cleaner prevents pin-holing or leaks. It is versatile and can be used in all types of indirect heating systems, including those with aluminium components. This product comes in a 1-litre bottle.. X400 High Performance Cleaner 1Litre Sentinel 50015125