1. Product Overview
The Tier1 Replacement Pool Filter Cartridge, model PAS-1515, is designed to provide efficient and reliable filtration for your swimming pool. It is a direct replacement for several popular filter models, ensuring a precise fit and consistent performance.
This cartridge features advanced trilobal fabric media, engineered to capture a higher percentage of debris compared to standard round fibers, promoting clearer water and reducing clogging. The robust construction includes reinforced end caps and a high-flow core to maintain structural integrity and optimal water circulation.

Image 1.1: Tier1 PAS-1515 Pool Filter Cartridge showing its dimensions (18-3/16" height x 8-11/16" diameter) and model number.
Key Features:
- Precision Fit: Engineered to fit seamlessly into compatible pool filtration systems, ensuring consistent performance without leaks or gaps.
- Advanced Filtration: Utilizes trilobal dirt-lock media that captures up to 40% more debris than standard round fibers.
- Consistent Flow: Internal high-flow core delivers steady water circulation, protecting pump performance.
- Durability: Independently tested to NSF 50 standards for performance and durability.
2. Compatibility
The Tier1 PAS-1515 filter cartridge is compatible with the following models:
- Sta-Rite PTM70
- Sta-Rite T-70TX
- Pleatco PSR70-4
- Pleatco PSR70
- Filbur FC-2540
- Unicel UHD-SR70
- WC108-57S2X
- AK-8019
- SD-00794
- SD-01128
Always verify your existing filter's dimensions and model number to ensure proper fit.
3. Installation Instructions
Follow these steps to replace your pool filter cartridge. Always consult your pool filter system's manufacturer manual for specific safety precautions and detailed instructions.
- Turn Off Power: Before beginning, turn off the power to your pool pump and filter system at the circuit breaker to prevent accidental startup.
- Relieve Pressure: Open the air relief valve on top of your filter tank to release any trapped air and pressure.
- Drain Water: Open the drain plug at the bottom of the filter tank to drain the water.
- Open Filter Tank: Remove the clamp or lid assembly that secures the top of the filter tank. Carefully lift the top half of the tank off.
- Remove Old Cartridge: Carefully lift out the old filter cartridge. It may be heavy due to trapped debris and water.
- Clean Tank: Rinse the inside of the filter tank to remove any debris. Inspect the O-ring for cracks or wear; replace if necessary. Lubricate the O-ring with a silicone-based lubricant.
- Install New Cartridge: Place the new Tier1 PAS-1515 filter cartridge into the filter tank. Ensure it sits properly on the bottom manifold.
- Reassemble Filter Tank: Carefully place the top half of the filter tank back onto the bottom half, ensuring the O-ring is correctly seated. Secure the clamp or lid assembly according to your filter system's instructions.
- Close Drain Plug: Close the filter tank drain plug.
- Prime Pump: Ensure all valves are in the correct position for filtration. Turn on the pool pump. Once water begins to flow, close the air relief valve when a steady stream of water emerges.
- Check for Leaks: Monitor the system for any leaks around the filter tank or plumbing connections.

Image 3.1: Diagram illustrating the precision engineering of the Tier1 filter for a perfect fit, highlighting exact OEM dimensions, snug lid seal, and rod alignment.
4. Operating Instructions
Once installed, the Tier1 PAS-1515 filter cartridge operates as part of your pool's filtration system. Its design ensures consistent water flow and efficient debris capture.
- Ensure your pool pump is running for an adequate amount of time each day (typically 8-12 hours, depending on pool size and usage) to circulate and filter the entire volume of pool water.
- Monitor your filter pressure gauge. An increase in pressure indicates that the filter is collecting debris and needs cleaning.
- The internal high-flow core of the Tier1 filter is designed to deliver steady water circulation, protecting pump performance without restricting pressure.

Image 4.1: Illustration of the advanced filtration process, showing how flat bonded media, core strength, and high-impact end caps contribute to superior debris capture and water flow.
5. Maintenance
Regular cleaning and timely replacement of your filter cartridge are crucial for maintaining clear pool water and extending the life of your pool equipment.
Cleaning the Filter Cartridge:
The Tier1 PAS-1515 cartridge is washable and reusable. Clean your filter cartridge when the pressure gauge on your filter tank reads 8-10 PSI above its normal clean operating pressure, or if you notice reduced water flow from your return jets.
- Turn Off Power and Relieve Pressure: Follow steps 1 and 2 from the Installation Instructions.
- Remove Cartridge: Follow steps 3 and 4 from the Installation Instructions to access and remove the cartridge.
- Rinse Debris: Use a garden hose with a spray nozzle to thoroughly rinse debris from between the pleats of the cartridge. Work from top to bottom. For stubborn debris, a specialized filter cleaning tool can be used.
- Soak (Optional): For a deeper clean, especially if the cartridge is heavily soiled or has accumulated oils and minerals, soak it overnight in a chemical filter cleaner solution according to the cleaner's instructions.
- Rinse Again: After soaking, rinse the cartridge thoroughly to remove all cleaning solution and loosened debris.
- Reinstall: Reinstall the clean cartridge by following steps 7-11 of the Installation Instructions.

Image 5.1: Visual demonstrating the advanced trilobal fabric of the Tier1 filter, which traps more debris and cleans faster, leading to less clogging and extended life.
Replacement Frequency:
The typical lifespan for a pool filter cartridge is 1-2 years, depending on pool usage, water chemistry, and maintenance frequency. The Tier1 PAS-1515 is designed for a filter use of approximately 3 months between cleanings under normal conditions. Replace the cartridge when it shows signs of wear, such as torn pleats, damaged end caps, or if it no longer effectively clears the water even after cleaning.
6. Troubleshooting
If you encounter issues with your pool filtration after installing the Tier1 PAS-1515 cartridge, consider the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Water Flow / High Pressure | Clogged filter cartridge, air in system, pump issues. | Clean the filter cartridge. Check for air leaks in the suction line. Ensure pump basket is clear. |
| Cloudy Pool Water | Dirty filter, improper chemical balance, insufficient pump run time. | Clean or replace filter. Test and adjust pool chemicals. Increase pump run time. |
| Leaks Around Filter Tank | Improperly seated O-ring, damaged O-ring, loose clamp. | Turn off pump, relieve pressure. Re-seat and lubricate O-ring. Replace O-ring if damaged. Tighten clamp. |
| Filter Cartridge Warping/Collapsing | Excessive pressure, improper installation, manufacturing defect. | Ensure proper installation. Monitor pressure. Contact support if issue persists. |

Image 6.1: Diagram illustrating how the Tier1 filter resists warping and collapse through reinforced end caps, a warp-resistant core, and high-pressure tolerance.
7. Specifications
Detailed specifications for the Tier1 Replacement Pool Filter Cartridge PAS-1515:
- Model Number: PAS-1515
- Product Dimensions: 18-3/16 inches (Height) x 8-11/16 inches (Diameter)
- Item Weight: Approximately 9.24 pounds
- Filter Media: Trilobal Fabric
- Filter Area: 70 sq. ft. (6.50 square meters)
- End Cap Type: 4-3/16 inch open top and bottom
- Manufacturer: Tier1
- Certifications: Tested to NSF 50 Standards

Image 7.1: Diagram highlighting key features that make Tier1 filters superior, including thick end caps, a heavy-duty high-flow core, and an efficient pleated design with 72 sq ft surface area.
8. Warranty and Support
Tier1 products are designed for quality and performance. This product includes a 90-day money-back guarantee.
For further assistance, technical support, or warranty claims, please visit the official Tier1 store or contact customer service through the retailer where the product was purchased.
You can find more information and support resources at the Tier1 Store on Amazon.





