Introduction
This manual provides essential information for the installation, operation, and maintenance of your Tetra Whisper Power Filter Impeller Assembly. This component is a direct replacement part designed to restore optimal performance to compatible Tetra Whisper Power Filters. Proper replacement of the impeller ensures efficient water circulation and quiet operation of your aquarium filter system.
Compatibility
The Tetra Whisper Power Filter Impeller Assembly (Model 25870-01) is compatible with the following Tetra Whisper Power Filter models:
- Whisper Power Filter PF60
- Whisper Power Filter PF3
- Whisper Power Filter PF4
- Whisper Advanced Power Filter PF30-60
- Triad 3000 Filter
Setup and Installation
Follow these steps to replace the impeller in your compatible Tetra Whisper Power Filter:
- Disconnect Power: Unplug the power filter from the electrical outlet to ensure safety.
- Remove Filter Cover: Carefully remove the filter cover and any media baskets to access the motor housing.
- Access Impeller: Locate the motor housing. Depending on your specific filter model, you may need to gently twist or unclip a cover to expose the impeller chamber.
- Remove Old Impeller: Grasp the old impeller and pull it straight out from the motor shaft. Note its orientation for correct installation of the new part.
- Clean Impeller Chamber: Clean any debris or buildup from the impeller chamber and motor shaft using a small brush or cotton swab.
- Install New Impeller: Carefully insert the new Tetra Whisper Power Filter Impeller Assembly onto the motor shaft. Ensure it seats properly and spins freely.
- Reassemble Filter: Reattach the impeller chamber cover, media baskets, and filter cover.
- Restore Power: Plug the power filter back into the electrical outlet. The filter should begin operating with renewed water flow.

Image showing the Tetra Whisper Power Filter Impeller Assembly, a replacement part for maintaining filter performance.
Operating Instructions
Once the new impeller is installed and the filter is reassembled and powered on, it should immediately begin drawing water and circulating it through the filter media. You should observe a strong, consistent water flow and significantly reduced operational noise compared to a worn impeller. The impeller is designed for continuous operation within the filter system.
Maintenance
The impeller is a moving part and can wear down over time due to continuous operation and mineral deposits. Regular inspection and timely replacement are crucial for maintaining filter efficiency.
- Inspection: Periodically check the impeller during routine filter cleaning for signs of wear, cracks, or excessive buildup.
- Replacement Frequency: Replace the impeller when you notice a decrease in water flow, an increase in operational noise (such as grinding or rattling), or if the filter stops pumping water effectively. The lifespan of an impeller can vary based on water conditions and usage, but typically ranges from 6 months to 2 years.
Troubleshooting
| Symptom | Possible Cause | Solution |
|---|---|---|
| Decreased water flow | Worn or damaged impeller, debris in impeller chamber. | Clean impeller chamber and motor shaft. Replace impeller if worn or damaged. |
| Unpleasant grinding or rattling noise | Worn impeller, foreign object in impeller chamber, mineral buildup. | Inspect and clean impeller chamber. Remove any foreign objects. Replace impeller if noise persists. |
| Filter not pumping water | Impeller not spinning, airlock, power issue, severely damaged impeller. | Ensure filter is primed and plugged in. Check impeller for damage and replace if necessary. |
Specifications
- Model Number: 25870-01
- Product Dimensions: 3 x 3 x 3 inches
- Item Weight: 0.11 Kilograms (approximately 4 ounces)
- Material: Metal
- Brand: Tetra
- UPC: 045623692003
Warranty and Support
For specific warranty information regarding your Tetra Whisper Power Filter Impeller Assembly, please refer to the documentation included with your original power filter or visit the official Tetra website. For technical support or further assistance, please contact Tetra customer service through their official channels.
You can often find support information on the Tetra Brand Store on Amazon or by searching for "Tetra customer support" online.