Manufacturers of these products are claiming that heating systems that are power-flushed with a cleansing fluid after installation and treated with corrosion inhibitor can perform far far better. One claim suggests that radiator outputs can be almost 200% better (article in PSLG mag Feb 2007) and also claim that boiler efficiency in untreated systems can fall by over 6% within three weeks.

My system has a massive water quantity -> 500 gallons so I've not done added any inhibitor but what is in this stuff made of and how can owners of large biofuel heating systems with accumulator tanks address the situation if the claims are true?