New diverter valve. Boiler over heating

Can anyone say if the Descalers are ok to use or do I need a specific acid? Spirit of salts is online but I can get the descaler today
 
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I treated it before the diverter was changed on the day with spirit of salts. I guess I didn’t allow enough time to dissolve the line scale.
That's dropped in a bit late in the thread!
Is that what most people nowadays call hydrochloric acid? Are you putting it in the whole system, or somehow treating the plate heat exchanger alone? I'd be nervous about putting HCl into carbon steel rads. More common to use a proprietary descaler.
 

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