This special system called “Magnapool” filtration uses a patented mixture of magnesium and potassium minerals from the ocean that can ensure that the water is perfectly sterilized, thus preventing highly polluting chemicals from entering the water and making it crystal clear and transparent.Magnesium chloride is transformed into magnesium hydroxide https://it.wikipedia.org/wiki/Idrossido_di_magnesio, a substance that is very gentle on the skin and acts like a magnet, helping to detoxify the body of impurities, making the skin smoother and softer. Water treated with this system will protect your tan.