COMPATIBILITY - The humidifier decalcification filter is compatible with all humidifiers featuring a water-filling diameter of 1.5 inches. Fits top-fill humidifiers including models Dual 150, Classic 160, Classic 300S, Dual 200S, OasisMist 450S, OasisMist 1000S, and 600S. FOCUS ON - These replacement humidifier filters deliver soft, healthy mist by capturing minerals and impurities from water. The filter helps maintain a clean humidifier, reduces white dust, and ensures optimal performance for the cleanest mist output. LAST LONGER - For best results, replace the decalcification filter every 30 to 40 days. Each package includes 8 filters. Simply insert the universal demineralization filter into your humidifier. Color: As shown in picture Material: Plastic Package Contents: 8 x Humidifier decalcification filters Note: This package includes only the items listed above; other products are not included. Note: Slight variations in color may occur due to lighting and screen display differences. Measurement error allowed is +/- 1-3 cm.