1. Introduction
The Pure Guardian H910BL Ultrasonic Cool Mist Humidifier is designed to guard against problems caused by dry air in your home. It provides relief for individuals experiencing dry skin, allergies, and cold or flu symptoms by dispersing a soothing, cool mist into the air. This humidifier is ultra-quiet, making it suitable for use during sleep, and its compact size is ideal for tabletops in small rooms.

Figure 1: Front view of the Pure Guardian H910BL Humidifier.
2. Product Features
- Ultrasonic Cool Mist Technology: Disperses a fine, cool mist quietly into the air.
- Silver Clean Protection: Embedded in the water tank to fight the growth of micro-particle formation on the tank surface.
- Compact Design: Ideal for small rooms, nurseries, and offices.
- Long Run Time: The 0.21-gallon tank provides up to 14 hours of continuous operation on the low setting.
- Adjustable Mist Output: Features low and high cool mist settings for personalized comfort.
- Directional Mist Nozzle: Allows you to direct the mist where it's needed most.
- Optional Night Light: Integrated night light feature, suitable for children's rooms.
- Safety Features: Automatic shut-off when the water tank is empty and a low water indicator light.
- Filter-Free Operation: No evaporating pads, sticks, or filters to clean or replace.

Figure 2: Humidifier in a home environment.

Figure 3: Key features: Mildew Resistant Tank, Cool Mist, Quiet Operation.

Figure 4: Coverage area up to 210 sq. ft.

Figure 5: Humidifier features: directional nozzle, tank capacity, mist settings.

Figure 6: Ideal for small rooms, nurseries, and kid's rooms.
3. Setup
- Unpack: Carefully remove the humidifier from its packaging.
- Placement: Place the humidifier on a firm, flat, water-resistant surface at least 6 inches (15 cm) away from walls and appliances. Ensure the mist outlet is not directed at furniture or electronics.
- Fill Water Tank:
- Remove the water tank from the base.
- Unscrew the tank cap at the bottom of the tank.
- Fill the tank with clean, cool water. Distilled or purified water is recommended to minimize mineral buildup. Do not fill past the indicated maximum fill line.
- Securely replace the tank cap.
- Place the filled water tank back onto the humidifier base, ensuring it is seated correctly.
- Connect Power: Plug the power cord into a 120V AC electrical outlet.
Video 1: A 360-degree view of the Pure Guardian H910BL Humidifier, demonstrating its design and components for easy setup.

Figure 7: Humidifier in operation, emitting mist.

Figure 8: Top view of the humidifier.

Figure 9: Rear view of the humidifier.
4. Operating Instructions
- Power On/Off: Press the power button located on the front of the base to turn the unit on or off. The power indicator light will illuminate.
- Adjust Mist Output: Cycle through the mist settings by pressing the power button. The humidifier offers low and high mist output options.
- Night Light: The humidifier features an optional night light. This light can be activated or deactivated by pressing the power button to cycle through the settings.
- Low Water Indicator: A red indicator light will illuminate when the water level in the tank is low, signaling that a refill is needed.
- Automatic Shut-Off: The unit will automatically turn off when the water tank is empty to prevent damage.
5. Maintenance
Regular cleaning is essential for optimal performance and hygiene of your humidifier. The Pure Guardian H910BL features Silver Clean Protection to inhibit the growth of mold and mildew on the surface of the water tank, but manual cleaning is still required.
Cleaning the Water Tank:
- It is recommended to clean the water tank every 2-3 weeks, or more frequently with regular use.
- Remove the water tank from the base and empty any remaining water.
- Use a bottle brush or a soft cloth with a mild soap solution to clean the inside of the tank.
- Rinse thoroughly with clean water to remove all soap residue.
Cleaning the Ultrasonic Disk:
- The ultrasonic disk, located in the base, should be cleaned regularly to prevent mineral buildup.
- Use the provided small cleaning brush to gently clean the surface of the ultrasonic disk.
- For stubborn mineral deposits, a solution of white vinegar and water can be used. Apply the solution to the disk and let it sit for a few minutes before gently scrubbing with the brush. Do not scrape or use abrasive materials, as this can damage the disk.
- Rinse the base thoroughly, ensuring no water enters the air outlet.

Figure 10: Silver Clean Protection feature.
6. Troubleshooting
- No Mist Output: Check if the unit is plugged in and powered on. Ensure the water tank is filled and properly seated on the base. The low water indicator light should not be illuminated.
- Unusual Noise: A slight buzzing sound is normal during operation. If the noise is excessive or unusual, ensure the unit is on a flat surface and the water tank is correctly positioned. Mineral buildup on the ultrasonic disk can also cause noise; refer to the cleaning instructions.
- White Dust: If you notice white dust around the humidifier, this is likely due to minerals in hard water. Using distilled or purified water can help reduce this.
- Leaking: Ensure the tank cap is securely tightened and the tank is properly placed on the base. Check for any cracks or damage to the tank.
7. Specifications
| Brand | PureGuardian |
| Model Name | H910BL |
| Product Dimensions | 4.33"D x 6.3"W x 8.4"H |
| Item Weight | 16 ounces (1 pound) |
| Tank Capacity | 0.21 Gallons |
| Run Time | Up to 14 hours (on low setting) |
| Floor Area Coverage | 210 Square Feet |
| Operation Mode | Manual |
| Voltage | 120 Volts (AC) |
| UPC | 817624010991 |
8. Warranty and Support
The Pure Guardian H910BL Ultrasonic Cool Mist Humidifier comes with a 1-Year Limited Warranty from the date of purchase. Please retain your proof of purchase for warranty claims.
For technical support, troubleshooting assistance, or warranty inquiries, please contact PureGuardian customer service. Contact details can typically be found on the official PureGuardian website or within the included instruction manual.
This instruction manual is included with your product to provide detailed guidance on setup, operation, and maintenance.




