Sentinel - X800 Fast Acting Cleaner 1L, targeted central heating system cleaning inside an hour, restores system efficiency by targeting corrosion debris, ideal for hot and cold systems

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X400 somehow seems to lose the power to keep dirt in suspension if left much more than about five weeks. In this scenario, the system may benefit from a manual flush using with X300. The system I’m dealing with is older than 6 months I am not recommending that anyone drinks it but I do taste a tiny amount on my finger to estimate how much acid is left. After cleaning, the system should be drained and flushed until the water runs clear. On refilling, the system should be treated with Sentinel X100 Inhibitor, or Sentinel X500 Inhibited Antifreeze. it's not cheap for a can of "liquid", but I suppose if it's got lots of magic in it then it's quite cheap!

Product | Central Heating Cleaning | Sentinel

Actually I should be fine, did not know the difference between single and double feed cylinders (//www.diynot.com/forums/viewtopic.php?t=206316).Thanks again Tony, all my radiators are quite recent (apart from one), had them upgraded around 3 years ago. Hopefully they should hold. I then opened all of the thermostatic valves on all 7 radiators, turned on the boiler by the mains and turned the temperature up to 25 degrees by the thermostat

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Continues bleeding the radiators downstairs, starting with the closet to the boiler until no water or sound could be heard I spoke to Rep acouple of years ago asking why some manufactures say 2 weeks and some 1 month is the max time to leave in the system. I bled the towel radiator in the bathtroom and then siphoned some water out so I could pour in 1L of Sentinel X800 If the radiators are hot at the bottom but cold at the top, the issue is more likely to be air than sludge in the radiators.

A constant flow of water kept on coming out of the radiator that is the closet to the drain valve which confuses me as no more water is coming out of the external and only drain valve