Originally posted by ona rampage link=1193619950/0#5 date=1194852924
No amount of Boiler De-scaling will ever correct this problem, thats a different part of the hydraulic circuit and physically isolated from the 3-Way Valve circuit by the valve itself. I suppose you could always tear the 3-Way circuit down every couple of weeks and clean it all out via other means but that would surely only result in the risk of more damage to the system than would ever be inflicted by back-flushing. After all, you are not exposing the system to higher than normal pressures experienced when you pull a Ristretto or Choke the Pump :-?.
Will leave it up to you I guess..... All the best
,Mal.

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