Introduction
This manual provides instructions for the proper use and maintenance of Pawfly PF-L Filter Cartridges. These cartridges are specifically designed to provide effective water filtration for Silenstream PF20, PF30, PF40, and PF75 Power Filters, ensuring a clean and healthy aquatic environment.

Image: Three Pawfly PF-L filter cartridges, highlighting their design and the activated carbon component.
Product Overview
The Pawfly PF-L Filter Cartridges are engineered with a multi-stage filtration system to maintain optimal water quality in your aquarium. Key features include:
- Fine Carbon Filtration: Contains activated carbon to absorb impurities, odors, and harmful substances.
- High-Density Fiber: The outer layer is made of soft cotton with high-density fibers to trap debris and waste particles.
- Compatibility: Exclusively designed for Silenstream PF20, PF30, PF40, and PF75 Power Filters.
- Dimensions: Each cartridge measures approximately 6 inches (L) x 4.5 inches (W).

Image: Detailed view of a Pawfly PF-L filter cartridge with its dimensions clearly marked.

Image: Compatibility information for the PF-L filter cartridge with various Silenstream power filter models.
Setup and Installation
- Preparation: Before installing a new cartridge, gently rinse it under cool tap water. This removes any loose carbon dust that may be present from manufacturing. Do not use hot water or soap.
- Power Off: Ensure your Silenstream Power Filter is unplugged from the power outlet before proceeding with installation or removal.
- Remove Old Cartridge: Carefully remove the old filter cartridge from the filter chamber. Dispose of the used cartridge responsibly.
- Insert New Cartridge: Place the new Pawfly PF-L filter cartridge completely into the designated filter chamber of your Silenstream Power Filter. Ensure it sits securely and correctly according to your filter's design.
- Power On: Once the new cartridge is securely in place, plug the power filter back into the electrical outlet.

Image: Visual guide demonstrating the rinsing and insertion steps for the filter cartridge.
Operating Principles
The Pawfly PF-L Filter Cartridges utilize a dual-layer filtration approach:
- Mechanical Filtration: The high-density fiber outer layer acts as a mechanical filter, trapping physical debris, uneaten food, and other particulate matter from the water. This helps keep the water clear and prevents clogging of the biological filter media (if present in your power filter).
- Chemical Filtration: The activated carbon inside the cartridge performs chemical filtration. It adsorbs dissolved organic compounds, odors, discolorations, and certain harmful chemicals, improving water clarity and reducing unpleasant smells.

Image: Diagram explaining the multi-stage filtration process within the cartridge.

Image: Benefits of activated carbon in maintaining water quality and fish health.

Image: Details on the effectiveness of activated carbon for deep filtration and odor removal.

Image: Explanation of the fine fiber filtration process and its benefits for water purification.
Maintenance
Regular replacement of your filter cartridges is crucial for maintaining a healthy aquarium environment. The activated carbon in the cartridges becomes saturated over time and loses its effectiveness.
- Replacement Frequency: Replace the Pawfly PF-L filter cartridge every 2 to 4 weeks. The exact frequency may vary depending on the bioload of your aquarium and the number of fish.
- Visual Inspection: Periodically check the cartridge for signs of heavy clogging or degradation. If the water flow through the filter significantly decreases, or if the water appears cloudy or develops an odor, it may be time for an earlier replacement.
- Disposal: Used cartridges should be discarded with regular household waste.
Important Note: When replacing cartridges, avoid replacing all filter media simultaneously, especially if your filter contains biological media. This can disrupt beneficial bacterial colonies and lead to an ammonia spike. If your filter has separate biological media, clean or replace it on a different schedule than the carbon cartridges.
Troubleshooting
- Cloudy Water:
- Ensure the cartridge is correctly seated in the filter chamber.
- Check if the cartridge is heavily clogged and needs replacement.
- Perform a partial water change in the aquarium.
- Reduced Water Flow:
- The cartridge may be clogged with debris. Replace it.
- Check the filter intake tube for obstructions.
- Unpleasant Odor:
- The activated carbon in the cartridge may be saturated. Replace the cartridge.
- Check for decaying organic matter in the aquarium (e.g., uneaten food, dead plants/fish).

Image: Visual representation of water clarity improvement after using the filter cartridges.
Specifications
| Feature | Detail |
|---|---|
| Model | PF-L |
| Compatibility | Silenstream PF20, PF30, PF40, PF75 Power Filters |
| Dimensions (L x W) | 6 inches x 4.5 inches (15.2 cm x 11.5 cm) |
| Filtration Media | High-density fiber, Activated Carbon |
| Recommended Replacement | Every 2 to 4 weeks |
| Material | Carbon Fiber |
| Item Weight (per pack of 3) | 3.84 ounces |
Product Video
Watch this official product video for a visual guide on the Pawfly PF-L filter cartridges and their benefits.
Video: An instructional video demonstrating the features and benefits of PF-L filter cartridges for Top Fin Power Filters.
Additional Information
For further assistance or product inquiries, please visit the official Pawfly store on Amazon:





