Replacement Humidifier Filter for Philips HU4801/01, HU4803, HU4803/01, HU4811, HU4811/10, HU4813, HU4813/10 For hygienic humidification with up to 99% less bacteria emissions than ultrasonic devices. Regular replacement ensures efficient and consistent humidification performance of your environment. Filters bacteria and limescale from the water before it can be released into the air. For models such as: Philips: HU4801, Philips: HU4801/01, Philips: HU4803, Philips: HU4803/01, Philips: HU4811, Philips: HU4811/10, Philips: HU4813, Philips: HU4813/10 - 100% compatible. - Tested product. - Long service life. - Bulk product. - Contents: - Replacement air filter for Philips humidifier HU4813/10, HU4813, HU4102/01. - For hygienic humidification with up to 99% less bacteria emissions than ultrasonic devices. Regular replacement ensures efficient and consistent humidification performance of your environment. - Filters bacteria and limescale from the water before it is released into the air.