fair enough, when i was at Kamco they said that they do not recommend powerflushing on microbore as the results will not be as good as on 15mm,22mm pipe due to not being able to get the high volumes through the pipes so i have never done it, if you've tried and been successful i will change my thoughts on this policy as i hate to turn away work.
If the system is working in as much as all pipes are getting hot there shouldn't be a problem, a pre dose is required and twin entry valves need changing and re-piping.
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