Getting Inhibiter into a sealed heating system

Hi,
This may seem a trivial matter to some but i have never done it!
My central heating is a sealed fully pumped system. I would like to flush it and add new inhibiter.
The flushing part i think i can handle. i.e. Connect a hose from the tap (check valvle) to the flow and a hose from the return to a drain.
How can i add the descaler? When it is fully flushed the system will be full of water...So how do i add the inhibiter? Probably the same way i add the descaler ;-)
Regards,
Rich
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You can add it through one of the radiator bleed valves, or directly into the boiler pipework through a bleed valve at the top.
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wrote:

I've used the exact same method.
The manufacturer's instructions generally involve injecting against the pressure of the system - i.e. close valves, remove vent screw, fit cartridge, open a valve and inject. The problem is that the nozzles do not seem to make a perfect seal so water tends to squirt out. Dropping the pressure and injecting into a wholly or partly empty radiator works much better.
.andy
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