Yes, they work for a short while in the pipe immediately after the
gadget, but then it wears off and is useless for domestic use.
Probably cheaper to have the local Shaman make up a charm and put that
on the rising main.
I have had one fitted for a few years and can honestly state that my kettle
and shower head need descaling MUCH less than before - probably once every 2
months as opposed to each and every week - unless that shaman broke into my
house and danced around a bit while I was at work :)
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