1. Introduction
Thank you for choosing the Sanitas SLB 40 Ultrasonic Humidifier. This device is designed to improve the air quality in your home or office by adding moisture to the air and can also be used with aromatic oils for a pleasant fragrance. Please read this manual carefully before first use and keep it for future reference. Proper use and maintenance will ensure long-lasting performance and safety.
2. Important Safety Instructions
- Read all instructions before using the appliance.
- Do not place the humidifier on soft surfaces such as carpets or rugs, as this may block the air inlet.
- Always place the humidifier on a firm, flat, waterproof surface at least 15 cm away from walls and appliances.
- Do not immerse the base unit in water or other liquids.
- Unplug the appliance before filling, cleaning, or moving it.
- Do not use the humidifier if the power cord or plug is damaged, or if the appliance malfunctions or has been dropped.
- Keep out of reach of children. This appliance is not intended for use by persons with reduced physical, sensory or mental capabilities unless supervised.
- Use only clean, cool tap water. Distilled or demineralized water is recommended to prevent mineral buildup.
- Do not add essential oils directly into the water tank. Use the designated aroma box.
- Regularly clean the water tank and transducer to prevent bacterial growth and mineral deposits.
3. Product Overview
Familiarize yourself with the components of your Sanitas SLB 40 humidifier.

Figure 1: Front view of the Sanitas SLB 40 Humidifier, showing the water level indicator and control knob.
- Mist Nozzle
- Water Tank Lid
- Water Tank
- Water Level Indicator
- Base Unit
- Control Knob (On/Off and Mist Output Adjustment)
- Aroma Box (located on the base unit)
- Power Cord
4. Setup
4.1 Unpacking
Carefully remove the humidifier from its packaging. Retain the packaging for future storage or transport. Check all components for any signs of damage.
4.2 Placement
Place the humidifier on a flat, stable, and waterproof surface. Ensure it is at least 15 cm away from walls and furniture to allow for proper mist dispersion. Avoid placing it directly on wooden furniture or near heat sources.
4.3 Filling the Water Tank

Figure 2: Removing the water tank from the base unit.

Figure 3: Opening the water tank cap for filling.
- Ensure the humidifier is unplugged.
- Carefully lift the water tank from the base unit.
- Unscrew the cap at the bottom of the water tank.
- Fill the tank with clean, cool tap water. Do not exceed the maximum fill line. Using distilled or demineralized water is recommended to reduce mineral residue.
- Securely screw the cap back onto the water tank.
- Place the filled water tank back onto the base unit, ensuring it is seated correctly.
5. Operation
5.1 Powering On and Adjusting Mist Output

Figure 4: The Sanitas SLB 40 Humidifier in operation, producing a fine mist.
- Plug the power cord into a suitable electrical outlet.
- Turn the control knob clockwise to switch on the humidifier. The indicator light will illuminate.
- Continue turning the control knob clockwise to increase the mist output. Turn it counter-clockwise to decrease the mist output.
- To turn off the humidifier, turn the control knob counter-clockwise until it clicks into the 'OFF' position.
5.2 Using the Aroma Function

Figure 5: The aroma box and filter pad for adding essential oils.
- Locate the aroma box on the base unit.
- Pull out the aroma box tray.
- Add a few drops of your preferred essential oil onto the aroma pad inside the tray. Do not add essential oils directly into the water tank.
- Slide the aroma box tray back into its slot.
- The aroma will be diffused with the mist during operation.
6. Maintenance and Cleaning
Regular cleaning is essential for optimal performance and hygiene.
6.1 Daily Maintenance
- Unplug the humidifier.
- Empty any remaining water from the tank and base unit.
- Rinse the water tank and base unit with fresh water.
- Wipe all surfaces dry with a clean cloth.
6.2 Weekly Cleaning and Descaling
- Unplug the humidifier and empty all water.
- To descale the transducer (the small metal disc in the base unit), mix a solution of equal parts white vinegar and water.
- Pour the solution into the base unit, ensuring it covers the transducer. Let it soak for 20-30 minutes.
- Gently clean the transducer with a soft brush (not metal) to remove any mineral deposits.
- Rinse the base unit thoroughly with clean water to remove all vinegar residue.
- Clean the water tank with a mild detergent and rinse thoroughly.
- Replace the aroma pad in the aroma box if it is discolored or no longer effectively diffuses scent.
6.3 Storage
If the humidifier will not be used for an extended period, clean it thoroughly as described above, ensure all parts are completely dry, and store it in its original packaging in a cool, dry place.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist output | No water in tank / Tank not seated correctly / Transducer dirty | Refill water tank / Re-seat tank / Clean transducer |
| Unusual odor | Stale water / Dirty tank or base | Empty and clean tank and base thoroughly. Use fresh water. |
| White dust around humidifier | Hard water (mineral content) | Use distilled or demineralized water. Clean regularly. |
| Water leakage | Water tank cap not tightened / Tank not seated correctly | Ensure tank cap is tight. Re-seat water tank properly. |
8. Technical Specifications
- Model: SLB 40 (681.08)
- Brand: Sanitas
- Operating Mode: Ultrasonic
- Capacity: 4 Liters
- Suitable Room Size: Up to 30 m²
- Special Feature: Silent operation, Aroma function
- Dimensions (L x W x H): 35 x 25.6 x 19 cm
- Weight: 1.29 Kilograms
- Material: Polypropylene
- Country of Origin: China
9. Disposal
Do not dispose of the appliance with household waste. Dispose of it in accordance with local regulations for electrical and electronic equipment. Contact your local authorities for information on disposal points.
10. Warranty and Support
Sanitas products are designed for quality and reliability. For warranty claims or technical support, please refer to the warranty card included with your purchase or contact your local Sanitas customer service. Keep your proof of purchase for warranty purposes.





