Simply drop one of these ingenious Ecozone Magnoloo into the cistern to keep your toilet free from a build up of deposits for up to 5 years. This chemical-free magnetic ring will polarize the calcium preventing unsightly stains and limescale build up. The high quality magnets inside the Ecozone Magnoloo convert the negative calcium ions into positive ions, which in turn modify the structure of the lime crystals and reduce or completely eliminate the formation of limescale staining. A little device that sits in the cistern and helps to eliminate lime scale build up and prolong the life of your cistern and toilet. Chemical free, magnetic anti limescale and descaler, calcium carbonate is simply flushed away.