Fresha Flush uses the same industrial silver as found in drinking water purifiers, hot tub filters and medical items including treatments used on burns victims. Fresha Flush uses the natural biocidal effects of real silver and gold that, when immersed in water destroys germs including viruses, bacteria, fungus and water-borne diseases, giving a sterile, chemical free flush every time. The ultra strong neodymium magnet crystalises limescale which prevents limescale forming on toilet surfaces. Fresha Flush is everlasting, very effective and prevents the need for bleaching toilets, this has a great environmental impact. Just place the disc in your toilet cistern and it will immediately begin it's work. Laboratory tested and proved effective, to approved European Standards.