BONECO A451 Anti-Mineral Pads for Steam Humidifiers, 6 pack The Anti-Mineral-Pad decreases the calcification of the vaporizer basin Reduces the frequency of the necessary decalcification Depending on the degree of water hardness, the pad has to be replaced every 2 to 4 weeks Includes 6 Anti-Mineral Pads per packaged box Use: BONECO S200, S250 & S450 Steam Humidifier