Introduction
This manual provides essential information for the installation, operation, and maintenance of your POOLPURE SPA Filter, Model C-4335. This filter is designed to replace various spa filter models, including Pleatco PRB35-IN, Unicel C-4335, FC-2385, Pentair R173431, Waterway 817-3501, and Dynamic 03FIL1300. It features advanced filtration technology to ensure clean and clear spa water.
The POOLPURE SPA filter is tested and certified by IAPMO against NSF/ANSI 50 standards, ensuring material safety and reliable performance for your spa.
Specifications

Image: Detailed diagram illustrating the filter's top and bottom caps, outer diameter, length, and compatible models.
Filter Dimensions:
- Outer Diameter: 12.73 cm (5 inches)
- Length: 23.5 cm (9 1/4 inches)
- Top Cap Opening: 5.48 cm
- Bottom Cap Opening: 5.48 cm
Compatible Models:
- Pleatco PRB35-IN
- Unicel C-4335
- Filbur FC-2385
- Pentair R173431
- Waterway 817-3501
- Dynamic 03FIL1300
Material:
- Advanced Trilobal Filtration Fabric
Certifications:
- IAPMO R&T certified against NSF/ANSI 50 for material safety.

Image: Visual representation of the NSF/ANSI 50 certification, indicating compliance with safety standards for materials.
Installation
- Turn Off Power: Before beginning, ensure all power to the spa or hot tub is turned off at the circuit breaker to prevent accidental operation.
- Locate Filter Housing: Identify the filter housing, typically found near the spa's pump.
- Remove Old Filter: Open the filter housing according to your spa manufacturer's instructions. Carefully remove the old filter cartridge. Dispose of the old filter responsibly.
- Clean Filter Housing: Inspect the filter housing for any debris or residue. Clean it thoroughly before installing the new filter.
- Install New Filter: Insert the new POOLPURE SPA filter cartridge into the housing. Ensure it is seated correctly and securely.
- Secure Housing: Close and secure the filter housing lid. Ensure all seals are properly in place to prevent leaks.
- Restore Power: Once the filter is securely installed and the housing is closed, restore power to the spa.
- Bleed Air: Follow your spa manufacturer's instructions to bleed any air from the system after filter replacement.
Operation
The POOLPURE SPA filter utilizes innovative "Dirt-Locking" technology and a unique Trilobal filtration fabric to maximize dirt retention and filtration efficiency. This design allows the filter to capture a wide range of contaminants, including hair, leaves, dust, sediment, and sand, ensuring cleaner spa water.

Image: Diagram showing how the filter's innovative technology traps various contaminants like bacteria, hair, leaves, dust, sediment, and sand.

Image: Comparison highlighting the increased effective surface area of POOLPURE's advanced trilobal media over standard point-bond supports.
Maintenance
Regular maintenance of your POOLPURE SPA filter is crucial for optimal performance and longevity.
Cleaning the Filter:
- Frequency: It is recommended to clean your filter cartridge every 2-4 weeks, depending on spa usage and water quality.
- Removal: Turn off the spa power. Remove the filter cartridge from its housing as described in the installation section.
- Rinsing: Use a garden hose with a spray nozzle to rinse debris from between the pleats. Start from the top and work your way down, rotating the filter. Ensure all visible debris is removed.
- Deep Cleaning (Optional): For a more thorough cleaning, especially if the filter is heavily soiled or has accumulated oils, use a specialized filter cleaning solution. Follow the cleaner's instructions for soaking and rinsing.
- Reinstallation: Once clean and thoroughly rinsed, reinstall the filter into the housing.
Filter Lifespan and Replacement:
With proper maintenance, your POOLPURE SPA filter is designed to last 1-2 years. The advanced trilobal fabric contributes to a 66% longer lifespan compared to normal point-bond fabrics. Replace the filter when you notice reduced water flow, persistent cloudiness, or damage to the filter material, even after cleaning.

Image: Visual comparison showing the extended lifespan of the advanced trilobal fabric filter compared to standard filter fabric.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Reduced Water Flow | Clogged filter, air in system, pump issue. | Clean or replace filter. Bleed air from the system. Check pump operation. |
| Cloudy Spa Water | Dirty filter, improper chemical balance, insufficient filtration time. | Clean or replace filter. Test and adjust spa chemicals. Increase filtration cycle duration. |
| Filter Housing Leaks | Improperly seated filter, damaged O-ring/seal, loose housing lid. | Ensure filter is correctly installed. Inspect and replace O-rings/seals if damaged. Tighten housing lid. |
Warranty Information
For detailed warranty information regarding your POOLPURE SPA Filter, please refer to the official POOLPURE website or contact their customer service directly. Keep your proof of purchase for any warranty claims.
Customer Support
If you encounter any issues or have questions not covered in this manual, please contact POOLPURE customer support. Contact information can typically be found on the product packaging or the official POOLPURE website.