COMPATIBLE: 6000S Humidifier Replacement Filters Compatible with for 6000S smart evaporative humidifier, very easy to install. Note: Suitable for all water types, including tap water. Using: We suggest replacing the humidifier wick filter every 3-6 months to keep the best performance, based on your usage and environment. Ideally, replace all four filters simultaneously for the best results. It's suitable to use in the living room,office,school and etc. Clean: We suggest you take out the filter when you don't use the machine, use limescale cleaner to clean it and dry the filter, it be length the using life. UNBEATABLE VALUE - We know replacing your filter is expensive so we've made it cheaper to replace that dirty worn-out filter more often without the high cost. Don't risk reintroducing airborne particles, just throw it away. Save time cleaning and vacuuming. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!