Read my two messages though, the side effects can be worse than the problem.
Incidentally way back when the old Tomorrows World was on somebody reckoned
they had designed heating elements for immersion heaters and kettles that
actively repelled the limescale, thus stopping the main reason for them
failing due to being insulated, thermally from the water they were supposed
to heat.
Strange then that most heaters still look like they always did and still
scale up.
Could it possibly be the idea was a dud? Surely not!
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Chris Hogg" wrote in message
...
On Sun, 7 Jul 2019 20:25:54 +0100, Gareth's was W7 now W10 Downstairs
Computer wrote:

Someone has just asked me about the device sold to stop
your water pipes and tanks furring up, which consists of
a coil wound around the pipe that is then excited by
an oscillator.

Personally, I think the whole thing to be bollox.

Does anybody know the physics behind it?

I cannot see how orienting the calcium saly ions
in one particular direction will stop furring up
some distance away especially if there has been
turbulent flow in between.

I advised him to get a water softener fitted instead.

The general scientific opinion is that it's ********. The practical
experience of some people is that they seem to work. YPYMAYTYP
https://tinyurl.com/y4cq59c5
https://tinyurl.com/y28rl5xq

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Chris