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If you notice a buildup of white powder in areas of your humidifier, you may be experiencing issues with hard water. Many places around the country have more lime in the water supply than other parts of the country. If you have concerns with lime, try using a water filter pitcher or an "on-sink" water filter and fill your humidifier with the filtered water for better results. You might also try purchasing bottled water in the gallon-jug size for use with your humidifier. Depending on the brand, you may see different results from a house humidifier, portable humidifier, etc. Some models are known for their lack of scaling, while others may be more sensitive to hard water.