These balls are cleverly designed to reduce limescale in your washing machine and dishwasher.
As you can see they are a unique shape, the idea being to induce a variety of magnetic fields.
These magnetic fields are created with a view to holding the limescale in the water.
The thinking is that less builds up in your machine and you get many of the benefits of being in a soft water area when washing with hard water.
You may find that clothes are softer, and dishes more shiny while your detergent use is reduced.
You also may find that your heating coils do not fur up as much and the deposits are softer.
Two Anti limescale balls supplied.
As well as these you can treat limescale with Aquamag, an electronic limescale treatment, Magnetic Water Treatment a clip on none electric water treatment and Toilet Descaler to go in your water cistern.