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it was fernox ds 40, the kettling did stop for a few weeks and is now back with this added whining (no not me!) just seems odd thats its worse than before, defiently seems like a flow problem but have no idea how to fix it! Header tank seems fine and fills up ok

ok, sorry but could I have that in English??? :lol: :oops:

I am the wife!!!!!!

thanks for that, have tried it but still the same!

have a glowworm economy plus, 10 years old. It was kettling so did a full system descale that was left in for one week, then flushed, a neutraliser was added and then flushed three times. Refilled and fernox inhibitor added. System was beautifully quiet for two weeks but very slowly the kettling...