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HV800PF Heavy Duty Cleaner is a fast acting power flush cleaner for older central heating systems. It helps to quickly remove corrosion deposits and scale in 1 hour, to fully restore system effciency. With its unique formulation, combining 3 different chemical technologies, the rapid sludge remover formula penetrates and dissolves corrosion and limescale deposits for rapid and effective removal during cleaning. It acts as a dispersing agent, under neutral pH conditions, eliminating any concerns associated with traditional acidic cleaners.