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I bought this as part of the ongoing Project World War Limescale. I bought this as I have had significant improvement for my taps and pipes with other products which work on similar principles. I bought this as it promised to keep my toilet free of limescale build up for up to five years.
It failed miserably.
It couldn't keep the limescale build up away for five days, let alone five weeks, months or years.
I do live in a extremely hard water area and in an old block of flats with pipework with decades of limescale lurking in them so I know that this was a big ask but I would have taken five months break from having to put heavy duty corrosive chemicals down the loo. This product could not deliver that.
And at £8.44 from Amazon I think I should have got that at very least.
I bought the twin pack from Amazon as I know my limescale is rock hard and tough to shift. I also have a large cistern - which is where you drop these gizmos - so as instructed I put in both magnets. They say that one should do the job - and it might in a very soft water area - but they do advise that you use two for hard water areas, so I did.
They are easy to use. Just take off the lid from the toilet cistern and pop these into the water in such a way that they don't block the flushing mechanism. It can be a fiddly task but with rubber gloves it is simple and dry. Then you leave them to do their work.
The theory is that these powerful magnets charge negative calcium ions into positive ones so that the limescale formation process changes and it doesn't stick. Existing scale in the cistern and bowl should also benefit and simply flush away.
As I said, I have had some success with magnetic water softening/limescale removal/control. That was with other makes and pipe-centric products with what felt like considerably more powerful magnets.
These feel a lot less powerful though before installing you should still keep them away from computers, mobile phones and any similar products as they are still powerful enough magnets to potentially do damage to hard discs and your data. Unwrapping the package they arrive in and cutting the plastic ties that attaches magnets to the card that keeps them in place for travel should probably be done in the bathroom to avoid this risk. After installation you can recycle the card.
The magnets are coated so should not rust in the cistern.
But they don't seem to do much else in mine otherwise.
If you are in a less hard a water area you might have better results. If you decide to throw an Amazon voucher at this product - as I did with a Nectar points one - you might be luckier than I was.
Otherwise, save your £8.44 for the corrosive chemicals bills.