Multipurpose: Suitable for hand showers with an ion filter. Built-in anti-limestone shower head with 3 types. Each color has 3 sizes that you can customize to your liking. White Stone: Mineral balls with negative ions, can increase pH (alkalinity), release negative ions, adjust water pH to slightly alkaline, reduce rust and restore smoother skin, make your hair shiny and smooth . Gray stone: Energy balls turn water molecules into small molecules. A large number of valuable minerals are easily absorbed by the skin. Helps with tiredness, promotes metabolism. Red Stone: Infrared mineral balls, can remove bacteria, residual chlorine from tap water and heavy metals and also have an antioxidant function. Healthy & Soothing: Made of high quality Maifan stone. Provides stronger adsorption and penetration than the source ore and is a kind of sterile, non-toxic and environmentally friendly water quality filter.