Pentair/Sta-Rite System 3 Modular Filter Cartridge
Best replacement filter for owners of System 3 modular pool systems.
This is the gold standard for maintaining pristine water clarity without the headache of aftermarket compatibility issues. By sticking to the original manufacturer’s design, you trade a slightly higher initial investment for guaranteed fitment and the peace of mind that your filtration system will run exactly as intended all season long.
$399.95
at
Sunplay
Who it's for
- Pool owners prioritizing crystal-clear water and longer maintenance intervals
- Homeowners wanting easier, manageable filter cleaning sessions
- Users seeking guaranteed performance and perfect system compatibility
Who should skip it
- Budget-conscious buyers avoiding high-cost, multi-part replacements
- Busy individuals preferring a quick, single-element rinse process
- Shoppers looking for affordable, widely available generic alternatives
Performance breakdown
Filtration Capacity
Expansive 209 square feet of surface area handles heavy debris loads easily.
Compatibility Precision
Genuine OEM design ensures a perfect, leak-free fit for System 3 housings.
Media Durability
High-grade pleated polyester resists tearing and maintains structural integrity under pressure.
Installation Ease
Standardized dimensions make swapping out old cartridges a straightforward, tool-free process.
Flow Efficiency
Optimized pleat spacing promotes consistent water circulation without straining the pump.
Maintenance Cycle
Large surface area extends time between cleanings for a lower-maintenance pool season.
Key Specs
Filter Type
Cartridge
Filtration Area
209 square feet
Compatible Pool Type
Spa
Filter Media Material
Pleated Polyester
Model Number
25021-0224S
Part Number
25021-0224S
Intended Use
Replacement for System 3 Modular Filter
Compatible Brands
Pentair, Sta-Rite
Compatible Models
System 3 Modular Filter
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