On 11/30/2016 4:49 PM, Peter Parry wrote:
> On Wed, 30 Nov 2016 03:21:38 -0800 (PST), Eusebius
> <
performan...@gmail.com> wrote:
>
>> So - how effective is an electronic descaler? Anyone have experiences and views?
>
> Some years ago following a lengthy defence here by an ex-supplier of
> ones using very strong permanent magnets I was sent a couple to try.
> My neighbour also had an electronic one I removed to experiment with.
> The test setup was basically a water supply which could be used in
> once through mode or re circulating. The test device was a kettle
> modified to stay at 80 deg C. Water either went through it once or
> could be circulated through it many times. The kettle was cleaned with
> acid, dried and weighed before each test and dried and weighed
> afterwards.
>
> The test was conducted using water passing once through the device
> (the normal situation for domestic installations) and also for the
> same water circulating through it many times (as found in industrial
> heating environments (where there are reports that high power magnetic
> devices seem to have some effect).
>
> Water from an ion-exchange softener was used as a comparator.
>
> The results were :-
>
> Simply heating water (with no softener of any type) caused an increase
> in weight of the kettle as calcium salts deposited on the element.
>
> The ion exchange softener water gave no change in weight of the test
> item after the test and no white deposit on the element.
>
> The strong magnet conditioner had no detectable effect on water in a
> single pass setup, calcium salts were deposited as for the no
> softener/conditioner.
>
> It had a small and barely measurable effect on the same water
> circulated through it hundreds of times. A smoother film formed on
> the element and it was just possible to measure a very small
> difference in weight change compared with the no conditioner/softener
> baseline.
>
> The electronic softener had no effect at all in any test, the results
> were exactly the same as for the baseline no softener with exactly the
> same increase in weight and noticeable white encrusting deposited.
>
> The Advertising Standards Agency regularly criticise suppliers of
> electronic conditioners :-
>
> "The ASA understands that no universally accepted theory about how
> these devices operate and no evidence to support the contention that
> the devices can inhibit scale formation generally exists.
>
>
Interesting.
When I moved to Gloucestershire many years ago, a colleague had moved to
a neighbouring house a couple of years previously. He was a very
competent, and very cynical physicist / geologist. He complained of
severe furring on kettles and other electrical heaters. Going against
his better judgement, he tried a magnetic device and was astonished to
discover that the deposits no longer built up, but crumbled and came off
as relatively fine powder. I repeated the experiment and found much the
same thing. A few years later I had to replace the water main, and for
various reasons removed the magnetic unit and found I no longer had
scaling problems. I can only imagine that the water source and/or
treatment was changed at some point, but at the time of fitting the
devices seemed to make a difference. Perhaps, when new, they were adding
some copper (or other) ions until a fully protective scale built up
inside them, and this was sufficient to provide temporary relief?