You might as well try to replace the whole of the microbore system as can become terribly clogged over time even a power flush won't sort. 15mm to the rads.
You can get anti corrosion lagging which is nasty sticky stuff. Plastic pipe is undetectable but won't corrode...
I wonder if someone could help?
I want to replace my shower pump as old one is leaking and OLD!
It has been wired via a junction box but also has a separate switch terminal (live + neutral) which powers the pump when the pull cord switch is on.
Do newer pumps have this separate switch...