1. Product Overview
The MisterVac Flat Pleated Filter is a high-quality replacement filter designed to maintain the optimal performance of your Nilfisk Alto Wap SQ 850-11 vacuum cleaner. This filter ensures excellent filtration, capturing dust and fine particles to protect the motor and maintain strong suction power. It is a compatible part, offering a reliable alternative to original filters.

Figure 1: MisterVac Flat Pleated Filter. This image shows the filter's pleated design, which maximizes surface area for efficient dust collection, ensuring compatibility and effective filtration for your vacuum cleaner.
2. Safety Instructions
Always observe the following safety precautions when handling or installing the filter:
- Disconnect Power: Before attempting any installation, removal, or maintenance of the filter, always unplug the vacuum cleaner from the power outlet to prevent electric shock.
- Handle with Care: Filters can contain dust and debris. Handle the used filter carefully to avoid releasing dust into the air.
- Proper Disposal: Dispose of old filters according to local waste disposal regulations.
- Keep Dry: Ensure the filter is completely dry before re-installing it into the vacuum cleaner, especially if it has been cleaned with water (if applicable for your specific filter type).
3. Installation Guide
Follow these steps to install the MisterVac Flat Pleated Filter into your Nilfisk Alto Wap SQ 850-11 vacuum cleaner:
- Prepare the Vacuum: Ensure the vacuum cleaner is unplugged from the power supply. Open the vacuum cleaner's housing to access the filter compartment. Refer to your vacuum cleaner's original manual for specific instructions on accessing the filter.
- Remove Old Filter: Carefully remove the old, dirty filter. Note its orientation to ensure correct installation of the new filter. Dispose of the old filter responsibly.
- Clean Compartment: If necessary, gently clean any dust or debris from the filter compartment before inserting the new filter.
- Install New Filter: Insert the new MisterVac Flat Pleated Filter into the compartment. Ensure it is seated correctly and securely, forming a tight seal. The filter should fit snugly without excessive force.
- Close Housing: Close the vacuum cleaner's housing, ensuring all latches or clips are properly secured.
- Test: Plug in the vacuum cleaner and perform a brief test to ensure proper operation and suction.

Figure 2: Illustrative image of the filter, representing the component to be installed. Always refer to your vacuum's specific instructions for filter compartment access.
4. Maintenance and Cleaning
Regular maintenance of your MisterVac filter is crucial for optimal vacuum performance and longevity. The frequency of cleaning depends on usage and the type of debris collected.
Cleaning the Filter:
- Tapping: Gently tap the filter against a hard surface (e.g., inside a waste bin) to dislodge accumulated dust and debris from the pleats.
- Brushing: Use a soft brush (like a paintbrush or old toothbrush) to carefully brush away stubborn dust from the filter pleats. Avoid excessive force that could damage the filter material.
- Compressed Air: For a more thorough cleaning, you may use compressed air to blow dust out from the inside of the filter outwards. Do this in a well-ventilated area or outdoors.
- Do Not Wash: This type of filter is generally not designed for wet cleaning. Washing may damage the filter material and reduce its effectiveness. Ensure the filter remains dry.
When to Replace the Filter:
Replace the filter when you notice:
- A significant decrease in suction power, even after cleaning.
- Visible damage to the filter material, such as tears or holes.
- The filter appears heavily discolored or clogged beyond effective cleaning.
- An unpleasant odor emanating from the vacuum cleaner during operation.
For optimal performance, it is recommended to replace the filter every 6-12 months, depending on usage.
5. Troubleshooting
If you experience issues with your vacuum cleaner after installing the MisterVac filter, consider the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Reduced Suction Power | Filter is clogged with dust and debris. Filter is not installed correctly. | Clean the filter as described in the Maintenance section. Ensure the filter is seated securely and forms a tight seal within its compartment. |
| Dust Escaping from Vacuum | Filter is damaged or not installed correctly. | Inspect the filter for any tears or damage; replace if necessary. Re-install the filter, ensuring it is properly seated and sealed. |
| Unusual Noises | Filter is not seated correctly, causing vibration. | Remove and re-install the filter, ensuring it is firmly in place and not loose. |
If these steps do not resolve the issue, please consult your vacuum cleaner's original manual or contact MisterVac customer support.
6. Specifications
- Product Type: Flat Pleated Filter
- Brand: MisterVac
- Compatibility: Nilfisk Alto Wap SQ 850-11 Vacuum Cleaners
- MisterVac Part Number: 4054288746668
- ASIN: B01F3H1BD4
- Reusability: Reusable (referring to cleaning, not infinite lifespan)
- Quantity: 1 item
7. Warranty Information
MisterVac® Device Warranty
The warranty is valid in all member states of the European Union. The statutory rights regarding material defects remain fully in force and are not limited by this warranty. The warranty covers the payment of all repair and shipping costs for defects that occur during the warranty period and are reported to MisterVac by the end-user, provided they are not based on intended consumption, wear and tear, improper handling, or force. In the event of a warranty claim, please contact the guarantor directly. After sending proof of purchase and the defective goods, the goods will, at the guarantor's discretion, either be repaired free of charge or replaced with an equivalent product. Further claims are not justified by this warranty.
8. Customer Support
For further assistance, questions, or warranty claims regarding your MisterVac Flat Pleated Filter, please contact MisterVac customer support directly. Please have your proof of purchase and the product's part number (4054288746668) ready when contacting support.
Contact information can typically be found on the MisterVac official website or on your purchase documentation.