Compatibility: Krcher WD1, WD2, WD 2 Premium, WD3P, WD3 Premium, WD 3200, WD 3230, WD 3230, WD 3500, SE 4001, SE 4002, MV 2, MV 3, MV 3, MV3P, A 2004, A 2054, A 2054, A 2101, A 2120, 2204, 2254, A 2604, A 2654, K 2150, KNT 2 PremiumMaterial: Using superior HEPA filter paper and melt-blown fabric, this product is made of high-density material, based on the original size.Blowing the dense fabric and HEPA filter paper with activated carbon particles, eliminates chest odor, purifies the air and absorbs harmful substances.Thanks to the good air permeability, there is no overheating of the motor, which provides better suction and extends the life of the vacuum cleaner.High-efficiency filter: The high-efficiency H12 HEPA filter is made of highly drug-resistant and environmentally friendly materials, which can remove 99.98% of dirt, hair and small debris down to 0.3 m (0.00003 mm).Powerful filter for deep cleaning of your home.EASY TO USE AND INSTALL: The filter is easy to install and durable.Changes in seconds without contact with dirt.These vacuum blocks can be washed and reused.It is recommended to renew the filter of your vacuum cleaner every 3 months for optimal performance, especially in homes with children, animals or smokers.