1. Product Overview
These replacement filters are designed for use with FWMB stainless steel cat water fountains, specifically models with 108oz (3.2L) and 135oz (4.0L) capacities. The filters are crucial for maintaining water quality and ensuring your pet has access to clean, fresh drinking water.

Image: FWMB Cat Water Fountain Filters and Sponges. This image displays the six blue replacement filters and two black foam sponges included in the package, along with visual representations of the compatible water fountains and the raw filtration materials.
Key Features:
- Compatibility: Specifically designed for FWMB 108oz/3.2L and 135oz/4.0L stainless steel cat water fountains (Model PET-HQ002-US).
- 5-Layer Filtration System: Utilizes a comprehensive filtration process to purify water.
- Double-Layer ABS Grille: Blocks hair and larger debris.
- Double-Layer Sponge Adsorption: Effectively filters out impurities.
- Graphite Resin Filtration Layer: Actively adsorbs residual heavy metals, ensuring healthier water.

Image: Double Cycle Filtration Diagram. This diagram visually explains how water is filtered through multiple layers within the fountain system to maintain cleanliness and freshness.

Image: 5-Layer Purifier Filter Breakdown. This image illustrates the individual layers of the filter, including the ABS grilles, non-woven fabric, activated carbon, and ion exchange resin, highlighting their roles in removing impurities.
2. Package Contents
The package includes the following components:
- 6 x Cat Water Fountain Filters
- 2 x Pre-Filter Sponges

Image: Package Contents. This image clearly displays the six blue filters and two black foam sponges that are included in the product package.
3. Setup and Installation
Filter Preparation:
- Before initial use or replacement, soak the filter pad in clean water for 5 minutes.
- Ensure the filter pad is thoroughly drenched. This step is critical to prevent water overflow during operation, as it allows water to pass through smoothly.

Image: Soaking the Filter. This image shows a blue filter submerged in water, emphasizing the importance of soaking it completely before use to ensure proper function.
Installation Steps:
- Disassemble your FWMB cat water fountain according to its specific instructions to access the filter compartment.
- Remove the old filter and sponge.
- Place the new pre-filter sponge around the pump.
- Insert the prepared filter pad into the filter box.
- Close the filter box securely.
- Reassemble the water fountain and refill it with clean water.

Image: Filter Installation Steps. This visual guide demonstrates the three key steps for installing the filter: soaking, placing the pump with the sponge, and securing the filter in its compartment.
4. Operating with Filters
Once installed, the FWMB filters work continuously to purify the water in your pet fountain. The 5-layer filtration system ensures that your pet receives clean and healthy water throughout the day by removing various impurities:
- Hair and Debris: The initial ABS grille and sponge layers capture pet hair, food particles, and other large debris.
- Impurities: The double-layer sponge further adsorbs finer impurities.
- Heavy Metals: The core graphite resin filtration layer is specifically designed to adsorb residual heavy metals from the water.
This multi-stage process contributes to a healthier drinking environment for your pet.
5. Maintenance and Replacement
Replacement Schedule:
- Carbon Filter: Replace the carbon filter (blue filter pad) every 4 weeks under normal conditions.
- Increased Frequency: During hot weather or if mosquitoes are present, replace the carbon filter every 2 weeks to maintain optimal water quality and hygiene.
- Foam Filter: Replace the foam filter (pre-filter sponge) every two months.
Regular replacement of both filter types is essential to ensure continuous clean and fresh water for your pet.
Cleaning:
While the filters themselves are disposable, it is recommended to regularly clean the water fountain components (basin, pump, etc.) according to your fountain's instruction manual to prevent buildup and ensure efficient operation.
6. Troubleshooting
Water Overflow or Slow Flow:
- Issue: Water is overflowing from the fountain or the water flow is significantly reduced after filter replacement.
- Solution: This often occurs if the filter pad was not thoroughly soaked before installation. Remove the filter, soak it in clean water for at least 5 minutes to ensure it is fully saturated, and then reinstall it.
Filter Not Fitting Correctly:
- Issue: The replacement filter does not seem to fit properly into the fountain's filter compartment.
- Solution: Verify that your fountain model is indeed compatible with these filters (FWMB 108oz/3.2L and 135oz/4.0L stainless steel cat water fountains, Model PET-HQ002-US). If you have a different model, these filters may not be suitable. Double-check the orientation of the filter during installation.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | FWMB |
| Model Compatibility | FWMB 108oz/3.2L and 135oz/4.0L Stainless Steel Cat Water Fountains (Model PET-HQ002-US) |
| Material | Carbon Fiber, ABS, Non-woven fabric |
| Product Dimensions (approx.) | 2.36"D x 4.33"W x 4.72"H |
| Product Benefits | Removes Heavy Metals, Impurities, and Hair/Debris for Cleaner, Healthier Water |
| External Testing Certification | CE |
| Unit Count | 6 Filters, 2 Sponges |
| Item Weight | 4.2 ounces (total package) |
| UPC | 630456335892 |
8. Warranty and Support
For any product problems or inquiries, please contact FWMB customer service. Your satisfaction is important, and assistance will be provided for any issues encountered with the filters.
You can find more information and contact details by visiting the official FWMB store: FWMB Store on Amazon.