IntroduceThis is an advanced humidification filter which can adsorb bacteria and scale. Function This humidifier filter prevents the growth and migration of mold, fungus, algae and bacteria. MaterialThis product is made from high quality wood pulp and can capture deposits found in water. Applicable modelsHU4801 / HU4802 / HU4803 Features Antistatic, waterproof, acid resistant, low temperature resistant, alkali resistant Product description Zerodis is a brand that stays true to reality and constantly seeks innovation. Our products cover many areas. home, kitchen, garden, baby products and toys. Since the company was founded, we have been committed to providing consumers around the world with the highest quality baby products and the most practical household items. This humidification filter is an advanced 20mm thick humidification filter that can absorb bacteria and limescale. For hygienic air humidification with 99% less bacteria emissions than ultrasonic devices. This product inhibits the growth and migration of mold, fungus, algae and bacteria. Regular replacement recommended for efficient and constant humidification. This product is made from high quality cellulose and can absorb deposits in water. Filters bacteria and limescale from the water before they can be expelled to the air. Installation steps. The first step: The second step: Third step: The fourth step: The Philips humidifier filter should be changed every three months.