1. Important Safety Information
Please read and understand all safety instructions before handling or installing the UV sterilizer tube. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- UV Radiation Hazard: This product emits UV-C radiation, which is harmful to skin and eyes. Never look directly at an illuminated UV lamp. Avoid direct exposure to skin.
- Electrical Safety: Always disconnect power to the UV sterilizer unit before attempting any installation, replacement, or maintenance. Ensure hands are dry when handling electrical components.
- Fragile Component: The UV tube is made of glass and is fragile. Handle with care to prevent breakage.
- Intended Use: This UV tube is designed exclusively for use in compatible SunSun UV sterilizers for pond and aquarium applications. Do not use for household lighting or other unintended purposes.
- Disposal: Dispose of old UV tubes according to local regulations for hazardous waste, as they may contain mercury.
2. Product Overview
The SunSun CUV-224 24W UV Sterilizer Tube is a genuine replacement part designed to maintain the effectiveness of your SunSun UV sterilizer. It helps to clarify water and promote a healthy aquatic environment by reducing algae and harmful microorganisms.

Image 2.1: The SunSun CUV-224 24W UV Sterilizer Tube, a clear glass tube with a white base and four gold pins.
Regular replacement of the UV tube is crucial for optimal performance of your sterilizer. Over time, the UV-C output of the lamp diminishes, even if it still appears to be glowing.
3. Specifications
| Feature | Specification |
|---|---|
| Brand | SunSun |
| Model Number | 50101-06 |
| Power | 24 Watts |
| Voltage | 24 Volts |
| Type of Light | UV-C |
| Bulb Shape | Tubular (T) |
| Average Lifespan | 6000 Hours |
| Dimensions (L x W x H) | 3.3 x 4.5 x 2.49 cm |
| Weight | 80 grams |
4. Installation and Replacement
Replacing the UV tube is a straightforward process that typically requires no special tools. Always ensure the UV sterilizer unit is disconnected from the power supply before proceeding.
Step-by-Step Replacement Guide:
- Disconnect Power: Unplug the UV sterilizer from the electrical outlet. This is a critical safety step.
- Access the UV Tube: Depending on your specific SunSun UV sterilizer model, you may need to unscrew an end cap or housing to access the UV tube. Refer to your sterilizer's manual for precise instructions on opening the unit.
- Remove Old Tube: Carefully grasp the base of the old UV tube and gently pull it straight out from its socket. Avoid twisting or bending the tube, as it may break.
- Inspect Quartz Sleeve (if applicable): If your sterilizer has a quartz sleeve protecting the UV tube, inspect it for cracks or mineral deposits. Clean the quartz sleeve if necessary, or replace it if damaged.
- Insert New Tube: Align the four pins on the base of the new SunSun CUV-224 UV tube with the corresponding holes in the sterilizer's socket. Gently push the tube straight into the socket until it is firmly seated. Do not force it.

Image 4.1: Exploded view of a SunSun UV sterilizer, illustrating how the UV tube (model 50101-06) fits into the main housing.

Image 4.2: A close-up view of the UV tube being carefully inserted into the sterilizer unit, showing the connection point.
- Reassemble Unit: Securely reattach any end caps or housing components that were removed. Ensure all seals are properly seated to prevent leaks.
- Reconnect Power: Plug the UV sterilizer back into the electrical outlet. The UV lamp should illuminate, indicating proper installation.
5. Operation
Once the new UV tube is installed and the unit is powered on, the UV sterilizer will begin its function. The UV-C light emitted by the tube works to neutralize harmful bacteria, viruses, and free-floating algae in the water as it passes through the sterilizer unit.
It is important to note that the UV tube itself does not produce visible light in the same way a household bulb does. The primary output is UV-C radiation, which is invisible to the human eye. Some sterilizers may have an indicator light to confirm the UV lamp is operating.
6. Maintenance
To ensure continuous effective performance of your UV sterilizer, regular maintenance of the UV tube is essential.
- Replacement Schedule: The SunSun CUV-224 UV tube has an average effective lifespan of approximately 6000 hours. It is generally recommended to replace the UV tube annually, ideally every spring, to maintain optimal UV-C output, even if the lamp still appears to be working. The UV-C intensity significantly weakens after this period.
- Quartz Sleeve Cleaning: If your sterilizer uses a quartz sleeve, it should be cleaned periodically to remove any mineral deposits or debris that can block UV-C light transmission. Always disconnect power before cleaning.
7. Troubleshooting
If your UV sterilizer is not functioning after replacing the tube, consider the following:
- No Illumination: Ensure the power cord is securely plugged into a working electrical outlet. Check if the UV tube is fully seated in its socket. Verify that the sterilizer unit's power switch (if present) is in the 'ON' position.
- Water Leakage: If water leakage occurs after reassembly, immediately disconnect power. Check all O-rings and seals for proper placement and condition. Ensure all housing components are tightened correctly.
- Reduced Effectiveness: If water clarity does not improve after replacing the tube, ensure the new tube is correctly installed and operating. Also, consider other factors affecting water quality, such as filter media condition or pond/aquarium size relative to sterilizer capacity.
8. Support and Warranty
For assistance with SunSun products or if you encounter issues not covered in this manual, please contact SunSun customer support. Refer to the contact information provided with your original UV sterilizer unit or visit the official SunSun website.
Information regarding the availability of spare parts for this specific UV tube is currently not available. Please contact SunSun directly for inquiries about spare parts.
Warranty information for the SunSun CUV-224 24W UV Sterilizer Tube is typically provided with the original product purchase. Please retain your proof of purchase for any warranty claims.





