Do magnets remove lime scale from water pipes?

26 April 2009


I’ve been told a magnetic field can dissolve lime scale in water pipes. Is this true and how does it work since the pipes and I believe the lime scale aren’t ferrous and not affected by a magnet.


We put this to Dr Hugh Hunt, from Cambridge University's Engineering department:

I am Hugh Hunt from Cambridge University Engineering Department. Well, there are lots of manufacturer's websites that claim that if you put magnets on your water pipes then that prevents limescale build up on the element of your immersion heater.

Well it's obviously in the manufacturer's interest to make these claims, but let's suppose that, in the last year, a manufacturer has sold a thousand of these devices and they get one letter which says how fantastic it is, another ten letters that say that doesn't work. Well they can give ten refunds. They have still made quite a lot of money and they can publish that one nice letter.

That my be what we are seeing on the websites [selling these gadgets]; that's possibly being a bit mean, but I am a bit puzzled that there aren't any quoted refereed scientific publications out of the mainstream literature [supporting these claims].

Surely if there was something really scientific going on here it would be well and truly understood. So I just wonder.

Now there are few possible candidate theories all to do with magneto-hydrodynamics and water memory and things to do with nucleation and so on, you can read all about these.

But where does that leave us? Well I think if you have found that one of these devices works for you, well it doesn't do any harm so you may as well carry on using it. But if you find that it doesn't work then perhaps there's no surprise in that.


I`ve used magnets for some time and find that I have very little trouble like round taps and in kettles,
My son and especially his wife was having trouble with shower heads blocking up taps and kettles, I suggested using magnets now they are fine. I don`t need scientific evidence I have experience.

I bought one of these devices and fitted it to plastic pipe before the water entered a water ionizer, it did NOT work the ionizer blocked up with limescale in a very short time.
I would like to know would it work any better on copper pipe, can anyone answer?

...because they are peddling you snake oil. As the answer above indicates, there's no scientific reason for it to work, and it doesn't!

So save your money and invest in a water softener instead!

Magnets do NOT remove the hardness in mains water - calcium carbonate is still there and that's that! A magnetic field or electric current MAY alter the ions temporarily as the water passes through the device, but the effect is very quickly lost. If they really did work as claimed, then water softener companies would soon go out of business. Concerned about the truth? Time to get real!

Yes when water pass through the magnetic, lime scales are removed, water ph value is better, helps to get the sewage treatment process fast by 50%.
Neither I m a supplier or a manufacture r , but an engineer who have did research for personal interest , I have tasted raw water and water passed through the magnwtic-- ans. It's taste better.
2. Germs do not originate.
I filled 2 drums one with sewage water directly, and other through the magnetic.
After 1 day I sent for cod and bod testing, and one with magnet passed the IS test.
After 7 days you can't stand near the drum , but you can easily stand near the drum where sewage wS passed through magnet.

If you can provide me with robust, reproducible data demonstrating that, in a blind trial, these devices achieve what you allege then I'll believe you. Somehow I doubt you'll be able to produce such data, because they don't exist...

Pitiful answer. No definate yes or no. Do you just not know, yourself? If so, say so. At least its an honest answer.

I don't think he's provided a pitiful answer; what he has highlighted is the lack of any published evidence to support the claims made by the people who make these devices that they are actually effective. A lack of evidence that they are not effective is not evidence that they are effective. Rather than speculate, he is expressing scepticism and urging people to think scientifically.

Your answer amounted to "well if it works, it works, and if it doesn't then too bad." You didn't answer the question at all. You could have at least provided a brief explanation of magneto-hydrodynamics or how magnetism affects calcium or nucleation. Perhaps even how strong magnetic fields may or may not affect non-ferrous materials like lime deposits.

Maybe the ones who say magnets don't work is they dont have enough calcium in their water to make a difference or maybe they are thinking the water will feel slippery. It doesn't! But I had my magnets on the pipes and then I had to get a new well. I thought I probably wouldn't need the magnets anymore and took them off! BIG mistake! I ruined a kitchen faucet and filled my other faucets with calcium deposits very quickly! So I put the magnets back on and saved my faucets from ruination. The way to clean a faucet is however, a job. They must be taken apart and cleaned with vinegar. Water will dissolve calcium but vinegar does a quicker job. After soaking the item for maybe half an hour and using a brush, all the calcium can be cleaned off. I also put a couple of tlbs of vinegar in my stool tanks about every 5 flushes. It keeps the works cleaner even with magnets on the line. It will also keep the stool itself free filling up with calcium and prevents backups.

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