Pentair Small Cartridge for System 3 Filters | 25021-0223S
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- Backordered: contact us for ETA
- SKU:
- 25021-0223S
-
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About This Item
The Pentair Small Cartridge (25021-0223S) is the OEM replacement 136 sq. ft. inner filter module for the System 3 Modular Media Filter, model S7M400.
What It Does
This module is the inner replacement element of the System 3's two-piece modular media design. It provides the filtration surface area that captures debris as pool water passes through the filter tank, and is designed to be replaced as a standalone module without requiring tank disassembly or replacement.
This is the smaller, inner cartridge for the S7M400. For the matching larger, outer cartridge, see part number 25022-0224S. Replace both to complete your filter service.
For a combo back of both filter cartridges, see the combo pack: 170146
Specifications
| Pentair Part Number | 25021-0223S |
| Part Name | Small Cartridge |
| Quantity Included | Each |
| Compatible Model | S7M400 |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | System 3 | S7M400 | 136 sq. ft. Inner Replacement Module |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Poolaroo Pro Tip
The shallow-pleat design of this module allows for quick maintenance — a garden hose rinse is typically enough to clear routine debris between deep cleanings. Inspect the module each season for torn media, cracked end caps, or a collapsed core, and replace it if damage is found to keep filtration area and system flow rate at spec.
