OK I have had all my radiators off and flushed them out and what a mess
they where.I've ran the system for 5 weeks with sludge remover
in.Drained it off with no sign of sludge and replaced my old pump,Wilo
50 with Grundfoss 16-50.Noticed that 3 of the rads flow was through the
LSV so I have replaced all of my TRV with bidirectional ones and set
them accordingly.I've balanced the system as best I can and have got
all the rads to about the same temp.Pump is set on speed 2.
The thing is the rads are hot but don't really warm the room up and I
now have one rad that needs bleeding at least once a week.I've still
got fernox superconcentrate to put in and I could turn the pump speed
up but is this the answer.
Any help would be appreciated