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Hello,

How do you add Sentinel X100 concentrate via a radiator on a sealed
system?

Do you have to partially drain the radiator?

What I would do is to turn off both valves then loosen one of the
connections at the radiator side of the valve to drain out some of the
(carpet staining) water - open the bleed valve to allow the water to run
out - then re-tighten and inject the Sentinel into the bleed valve. However
my radiators have a large bung in the top which has the bleed valve in it -
I have a square key to remove the bung- then re-fit using PTFE tape.

If I ever fit a system of my dreams it will have a drain point to the
outside of the house and a dosing point (whatever one is)