System 3 Modular Filter
Maintain your pool's clarity with the Pentair/Sta-Rite System 3 Modular Filter Cartridge. This is the genuine manufacturer replacement for the small cartridge (S7M400), offering an expansive 136 square feet of filtration area. Designed to ensure smooth system operation, this original component guarantees optimal performance and compatibility with your existing System 3 unit. Keep your pool water pristine with this essential, high-quality filter element, identified by part number 25021-0223S.
$249.95
Owner Satisfaction
3.3
/ 5
Category Rank
1429
/ 1450
#1429 in Pool & Spa Filters
Price vs Category Average
+60%
Above average
Part Number
250210223
/ -S
Who it's for
- Near-DE Clarity
- Simplified Maintenance
- High Flow Rate Design
Who should skip it
- Bulky Installation
- Proprietary Cartridge Cost
- Premium Price Point
Key Specs
Part Number
25021-0223S
Model Identifier
S7M400 (Small Cartridge)
Filtration Area
136 square feet
Filter Type
Cartridge
Compatible Brands
Pentair, Sta-Rite
Intended Use
Replacement for System 3 Modular Filter
Features
- Original manufacturer replacement cartridge
- Designed for System 3 Modular Filter
- Provides 136 sq. ft. filtration area
- Ensures smooth system operation
- Genuine Pentair/Sta-Rite component
- Model S7M400 small cartridge
What customers say
Users overwhelmingly celebrate this filter for achieving exceptional water clarity, consistently delivering crystal clear results. This superior filtration performance is the main reason for high satisfaction among those prioritizing water quality. However, the system faces significant criticism regarding maintenance and usability. The modular design, intended for simplicity, is often described as cumbersome, messy, and physically demanding during cleaning and reassembly. Difficulty in correctly seating components frequently causes leaks and operational frustration. Furthermore, the high cost and proprietary nature of replacement cartridges negatively affect long term value. While filtration output is excellent, potential buyers must balance this power against the considerable labor and financial investment required for upkeep.
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