Triple filtration system and grinding filter - Mesh (PP cotton - filters hair and other impurities), activated carbon filter (absorbs odors and residues), and ion exchange resin and water circulation filter. Intelligent working mode - Equipped with a light sensor and a water volume display, the water fountain can automatically adjust the water flow frequency between day and night when operating in Smart Mode, a quieter and energy-saving mode. In Normal Mode, the water will continuously bubble to ensure that your pets always have access to water, especially after intense activity. Low water level alarm and automatic shutdown when water is low. Filter replacement notification - Filter control light will indicate when to replace the filters. Ultra-silent system - the noiselessly designed pump and unique, twisted water flow provide a special and calm experience for pet owners.