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These can take quite a while to pump up, especially if you are using a pants £4.99 foot pump from Halfords ! Even though it gives a precharge pressure on the side of the expansion vessel it might have been set at a lower pressure for a reason. As per the previous post, could be a good idea...

Hi Phazed, I'd put money on it being scale in the bottom of the cylinder. I also live in a very hard water area & I've done loads of these. If you have a balanced cold water take off and your flow from the cold taps is ok then that would pretty much prove it is scale & its not difficult to...