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Ah, that makes perfect sense now !! Thanks for clarifying that. Is it better to do it on an upstairs radiator (less volume of water to push upstairs against gravity as the X200 displaces some to get into the radiator) ?? Yeah, I'm in two minds whether to do it the old fashioned way...

Thanks, but if the radiator is already full up with water, how is there room to inject more liquid, or will removing the bleed screw allow enough water to drain before injecting Sentinel ?

Hi. I apologise if this is a daft question, but I need to add some Sentinel X200 to my system and am interested in the Rapid Dose system for ease. However, I was wondering how it works with the Open Vented System that I have. If you close off a radiator, and add the dose via the bleed...