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I set the valves for hard-water, drained the c.h. system down let it refill, drained it again, filled it again and drained it again! Hopefully that should have got rid of the bulk of the soft water. Then I refilled adding X100 as I did. I guess that's as safe as I'm going to get. After adding...

Yes, I have the three valve setup. What I don't know (yet) is where the header tank refills from. If it's the rising main, then I'll be OK once I've switched the softener out of circuit. If it's the big loft tank, then I guess I'll need to leave the softener out for a few days until the tank...

Aha! Does that mean I don't have a problem with the boiler and softened water then? <fingers crossed>

Softened water - I'm hoping the X100 will deal with any corrosion problems the soft water might otherwise cause. Is that not the case? X200 - lots of boiler noise so I'm hoping X200 will help with this, if it's down to scale (the heating system has been filled with hard water up to now)...

I have an old boiler (at least 17 years), an Ideal Mexico Super CF75. Does anybody know if it's likely to have an aluminium heat exchanger? Not sure how long they've been making them of aluminium? The boiler is built like a tank (so to speak) so I was hoping the exchanger might be cast iron or...

We've just had some work done on the house and we now have a water softener and soft water in the central heating system. I'm going to add Sentinel X100 to the system as this specifically says it will work with soft water. I'm considering adding Sentinel X200 (boiler noise reduction by...