Product Overview

Keep your pool water crystal clear with the genuine Pentair 170145 S7M120 Inner and Outer Cartridge Pack, designed specifically for the Sta-Rite System 3 S7M120 Modular Media Filter (300 Sq. Ft.). This OEM replacement kit includes both the 100 sq. ft. inner cartridge and the 200 sq. ft. outer cartridge, restoring your filter's original performance for maximum water clarity, flow, and debris removal.

Manufactured by Pentair, these replacement cartridges feature high-quality pleated filtration media, reinforced cores for durability, and exceptional dirt-holding capacity. Using genuine Pentair replacement cartridges ensures an exact fit, optimal filtration, and long-lasting performance.

Key Features

Genuine Pentair OEM replacement cartridge pack

Complete replacement set for the Sta-Rite System 3 S7M120 Filter

Includes one 100 Sq. Ft. inner cartridge

Includes one 200 Sq. Ft. outer cartridge

Total filtration area: 300 Sq. Ft.

Heavy-duty reinforced cores for added strength

Premium pleated media captures fine dirt and debris

High dirt-holding capacity extends cleaning intervals

Easy drop-in installation

Restores original filter performance

Benefits

Produces cleaner, clearer pool water

Maintains proper water flow and filtration efficiency

Helps reduce strain on your pool pump

Long-lasting OEM construction

Exact fit with no modifications required

Easy to install and maintain

Specifications

Warranty & Compatibility

Compatible Filter Models

Fits:

• Pentair Sta-Rite System 3 S7M120
• Sta-Rite Modular Media 300 Filter

Does Not Fit:

• S7M400
• S8M150
• S8M500

Installation Information

1. Turn off power to the pump.
2. Relieve all pressure from the filter tank.
3. Open the filter housing.
4. Remove the existing cartridges.
5. Clean the inside of the filter tank.
6. Install the new inner cartridge followed by the outer cartridge.
7. Inspect and lubricate the tank O-ring if needed.
8. Reassemble the filter and restart the system.

Confirm Before Ordering

Please verify the following before purchasing:

• Your filter model is Sta-Rite System 3 S7M120
• Your filter requires both an inner and outer cartridge
• You are replacing the complete 300 Sq. Ft. cartridge set
• Your existing replacement part number is 170145

Warranty Information

This genuine Pentair replacement cartridge pack is covered by the manufacturer's limited warranty against defects in materials and workmanship. Warranty coverage is subject to Pentair's warranty terms and conditions.

Customer-Facing Q&A

Q: Does this kit include both filter cartridges?
A: Yes. It includes one 100 Sq. Ft. inner cartridge and one 200 Sq. Ft. outer cartridge for a total filtration area of 300 Sq. Ft.

Q: Is this an OEM Pentair replacement?
A: Yes. This is a genuine Pentair replacement cartridge pack designed for the Sta-Rite System 3 S7M120 filter.

Q: Which filter model does this fit?
A: It is designed exclusively for the Pentair Sta-Rite System 3 S7M120 Modular Media Filter.

Q: How often should the cartridges be replaced?
A: Under normal operating conditions, replacement is typically recommended every 1–2 years, depending on pool usage, water chemistry, and maintenance.