Having successfully cleaned, drained and refilled my system I managed to get the system working
I just need to add the Inhibitor now. I did not add it has I refilled due to our system being more prone to airlocks and needed draining to get some of the rads downstairs to work - I don't want to mess with it now.
I thought maybe the best way to add it now was to tie up the ball valve in the F/E tank and take out some water, but make sure it doesn't fall below the feed pipe level, add inhibitor, and then fill by releasing the ball valve, this way there is less chance of inhibitor just sitting at the bottom of the tank, and no chance of airlocks.
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