Scalemaster Heating System Chemical Concentrates have been specifically formulated to deliver the high level of performance demanded by modern central heating systems. All products are suitable for both sealed and open-vented systems fitted with high-efficiency condensing boilers (including those with aluminium heat-exchangers). Supplied in 1Ltr bottles or handy cartridges with a registered desgin applicator nazzle which allows easy injection via a conventional radiator bleed valve, even where this is at the rear of the radiator. Scalemaster Heating System Chemical Concentrates actively contribute to long-term heating system health and preformance. Scalemaster Heating System Chemical Concentrates help maintain overall system interitiy. Fully compatible with all metals and materials commonly found in modern boilers and heating systems.