X800 is extremely aggressive and can not be left in, it will eat pump bearings and pinhole radiators if you dont get it all out, use the x400Why not use X800 Ian? The gas guy Im talking t o at work suggests using X800 and leaving it in for several days before flushing it all out
10mm pipe is not microbore, microbore is 8mm pipe22mm pipe with some 10mm pipe dropping down to some of the radiators.
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