My closed CH system is 10 years old and was installed with 10mm plastic pipe & fittings. I fitted a Magnaclean about 5 years ago which has collected a lot of gritty deposits but some radiators are not heating up fully. I have introduced Sentinel X400 and will flush out according to instructions one rad at a time. Can I open the filling loop as I flush through to improve pressure & can I additionally run the pump to further increase fushing force.
cheers
John
cheers
John
