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I don't think it matters how old a post is, it is still interesting and helpful for people like me to be able to read them and for others to read my reply if they have a similar problem.

Thanks for bringing the issue to light of phosphate deposits blocking Combicare pipework. I've had a Grant external combi boiler for 4 years and have been changing the Combicare cartridge every year. This year I couldn't get the cartridge off easily and there was some foam leaking out of a...