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Its quite spooky that we had identical boiler problems. DS40 has not eaten through anything yet, but the improvement is incrediable. Just dropped pump down to speed 1 & all is quiet. Amount of gassing up is amazing--- I suppose its chemical reaction from it eating limescale. But a nighlty...

Evening, How strange is that - I posted the same problem with my gloworm 60ff today. Have a look at my post & I will keep it updated.

UPDATE ---- DS40 (now decided its good stuff!) been in system 4hrs now. I have just been able to drop the pump speed to number 2 without a tractor with no big ends sound effect. Looks like its working its magic. At this rate I will be back on speed 1 tomorow FINGERS CROSSED.

If this DS40 treatment does the trick, I will "completely" flush the system & make sure the water is treated to the best of its ability. If I change the whole boiler, I will do the same & keep on top of it. I am just astounded at the repair prices compared to brand new, & besides the boiler...

I would love to just get the heat exchanger replaced. But those nice service people want £225 +VAT to come out to look. This covers all parts except guess what? HEAT EXCHANGER. When I told the nice lady that I am 99.9% sure thats the noisy bit she eventually got me a price for it ----£389 + VAT...

Good morning all. My central heating system is 5 years old. It is standard gas fired pumped open vented system. Boiler is a glowworm 60f economy plus ff. The problem is the noise from the boiler when the burners are heating the exchanger. The noise is gone as soon as the fllame drops out on...