【TRIPLE LAYER FILTRATION SYSTEM】Designed with a multi-layer structure combined with ion-based purification material to help improve water quality before mist release. 【IMPROVED AIR COMFORT】Helps reduce water impurities to produce cleaner mist suitable for sensitive breathing environments. 【REDUCED DEVICE MAINTENANCE】Minimises internal buildup in humidifier systems, helping reduce cleaning frequency and maintenance effort. 【HIGH WATER CAPACITY DESIGN】Each cartridge supports up to 150 litres of water filtration for extended usage before replacement. 【WIDE MODEL COMPATIBILITY】Compatible for DREO humidifier models including HM306, HM311 series and HM524 series.