Sta-Rite has long been a trusted name in pool filtration, known for its high-performance cartridge and modular media filters. The brand’s System:3 and Posi-Flo Posi-Clear filter series are particularly popular among pool owners who value efficient water clarity, easy maintenance, and durability. Over time, however, filter cartridges can lose efficiency as debris, oils, and minerals accumulate on the filter media. Replacing them at regular intervals ensures continued optimal water flow and filtration performance.
In this guide, we review the most commonly used Sta-Rite replacement filter cartridges — covering both the System:3 SM Series Modular Media Filters and the Posi-Flo Posi-Clear Canisters. We outline their filtration capacities, life spans, and key features, along with third-party alternatives and when to replace them. A dedicated technical specifications section at the end of each product overview helps you verify fitment and compatibility before purchase.
System:3 SM Series Modular Media Filters S7M120 and S7M400
The Sta-Rite System:3 SM Series filters — S7M120 and S7M400 — are designed for superior filtration efficiency, using dual-cartridge media that can handle heavy debris loads. With a high dirt-holding capacity, these cartridges maintain excellent water clarity with minimal maintenance. Their large surface area ensures long filter cycles, reducing the need for frequent cleanings.
- Filtration Capacity: 300–400 sq. ft. depending on model
- Life Span: 12–18 months with regular cleaning
- Key Features: Dual-cartridge modular design, quick-lock ring, corrosion-resistant housing
- Third-Party Options: Available from Unicel, Pleatco, and Filbur
- When to Replace: Every 12–24 months or when water flow decreases noticeably
Technical Specifications
- Material: Reinforced polyester media, molded end caps
- Dimensions: 25.5″ height × 8.5″ diameter (per cartridge)
- Compatible Models: Sta-Rite System:3 S7M120, S7M400
System:3 SM Series Modular Media Filters S8M150 and S8M500
The S8M150 and S8M500 models are ideal for large pools requiring high-capacity filtration. These units employ advanced modular cartridge technology that allows for increased surface area and reduced maintenance frequency. The filters are easy to service, offering tool-free access and quick cartridge replacement.
- Filtration Capacity: 450–500 sq. ft.
- Life Span: Up to 2 years with routine cleaning
- Key Features: High dirt-holding capacity, low maintenance, excellent water clarity
- Third-Party Options: Pleatco PSR150-4, Unicel S8M500 compatible sets
- When to Replace: 18–24 months or sooner if pressure builds up rapidly after cleaning
Technical Specifications
- Material: Polyester filter media with molded end caps
- Dimensions: 28″ height × 9″ diameter (per cartridge)
- Compatible Models: Sta-Rite System:3 S8M150, S8M500
Sta-Rite Posi-Flo Posi-Clear Filter Canisters PXC75
The Posi-Flo PXC75 filter canister offers a compact and efficient design suitable for small to medium-sized pools and spas. Known for its straightforward maintenance and excellent filtration, this cartridge captures fine debris for consistently clear water. The unit’s compact housing makes it ideal for limited equipment spaces.
- Filtration Capacity: 75 sq. ft.
- Life Span: 12–15 months under regular use
- Key Features: Compact size, easy lid removal, durable materials
- Third-Party Options: Compatible Pleatco PXC75, Unicel C-7477
- When to Replace: Annually or when the pressure gauge reads consistently high after cleaning
Technical Specifications
- Material: Reinforced polyester pleated media
- Dimensions: 20.1″ length × 7″ diameter
- Compatible Models: Sta-Rite Posi-Flo PXC75
Sta-Rite Posi-Flo Posi-Clear Filter Canisters PXC95
Slightly larger than the PXC75, the PXC95 offers greater filtration surface area and improved debris retention. Ideal for mid-sized pools, it provides dependable operation with minimal maintenance requirements. Its rugged design ensures long-term reliability and ease of cartridge replacement.
- Filtration Capacity: 95 sq. ft.
- Life Span: 12–18 months
- Key Features: Easy installation, corrosion-resistant tank, efficient particle capture
- Third-Party Options: Pleatco PXC95, Filbur FC-2570
- When to Replace: 12–24 months or when water clarity decreases
Technical Specifications
- Material: Polyester pleated cartridge
- Dimensions: 23.25″ height × 7″ diameter
- Compatible Models: Sta-Rite Posi-Flo PXC95
Sta-Rite Posi-Flo Posi-Clear Filter Canisters PXC125
The PXC125 cartridge filter provides higher capacity filtration suited for large residential pools. Its robust design ensures efficient dirt removal and stable pressure even under continuous use. The large filter area promotes longer cleaning intervals and improved energy efficiency.
- Filtration Capacity: 125 sq. ft.
- Life Span: 18–24 months
- Key Features: Large surface area, easy access lid, durable tank construction
- Third-Party Options: Unicel C-7478, Pleatco PXC125
- When to Replace: 18–24 months or if pressure remains high post-cleaning
Technical Specifications
- Material: Polyester media, reinforced plastic core
- Dimensions: 25.5″ height × 7″ diameter
- Compatible Models: Sta-Rite Posi-Flo PXC125
Sta-Rite Posi-Flo Posi-Clear Filter Canisters PXC150
The PXC150 is the largest model in the Posi-Clear line, offering powerful filtration performance for large pools. Its heavy-duty construction and oversized cartridge provide exceptional dirt-holding capacity, extending cleaning intervals and ensuring superior water quality.
- Filtration Capacity: 150 sq. ft.
- Life Span: 18–30 months with proper maintenance
- Key Features: High flow rate, long-lasting media, quick-release lock ring
- Third-Party Options: Pleatco PXC150, Filbur FC-2575
- When to Replace: Every 2 years or when cleaning frequency increases significantly
Technical Specifications
- Material: Reinforced polyester pleats, molded end caps
- Dimensions: 28″ height × 7″ diameter
- Compatible Models: Sta-Rite Posi-Flo PXC150
Conclusion
Sta-Rite’s range of filter cartridges offers reliable and efficient filtration solutions for pools of all sizes. The System:3 series excels in modular media performance for large pools, while the Posi-Flo Posi-Clear line delivers compact yet powerful filtration for smaller installations. Whether you choose OEM or compatible third-party replacements from brands like Unicel, Pleatco, or Filbur, regular cartridge replacement ensures consistent water clarity and optimal system performance. Always verify model compatibility and follow the manufacturer’s maintenance schedule to maximize filter lifespan.
For more Replacement Filter Cartridges and other Sta-Rite Products, visit Sta-Rite Store on Amazon and Sta-Rite Website
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