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Thanks Simon, I think he has access to a machine, seeing as his ads for boiler installations include power flush, and just took the easy, cheaper option. I haven't fully paid him - wondering if mulling the chemicals around for 2 weeks will work, but concerned the dirty water circulating through...

Hi, I had a new Glowworm Ultracom installed and a chemical flush done as the installer said my pipework was too old/fragile for a power flush as there was a risk of leakage. The chemical flush had no effect and he has suggested leaving the chemicals in the system for two weeks and run the...