Pentair | 25021-0223S | Sta-Rite System 3 Filter Cartridge | 136 sq ft

The Pentair 25021-0223S filter cartridge is a replacement filtration element designed for Sta-Rite System 3 Modular Media SM Series pool and spa filter systems, specifically the S7M400 model. This cartridge provides 136 square feet of filtration area and captures dirt, debris, and fine particles from circulating pool water. Its pleated polyester media and reinforced construction help maintain efficient filtration and extended service intervals.

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Key Features

• Replacement inner cartridge designed for Sta-Rite System 3 SM Series S7M400 modular media filters.
• Provides 136 square feet of filtration surface area for efficient debris and contaminant removal.
• Pleated reinforced polyester filter media increases dirt holding capacity and filtration efficiency.
• Durable polyurethane end caps and reinforced core provide strength and long service life.
• Approximate dimensions of about 9 inches diameter and 29–32 inches length ensure proper fit in compatible filters.
• Designed as the smaller inner cartridge used alongside the larger outer cartridge in the S7M400 filter system.

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Product Overview

The Pentair 25021-0223S replacement cartridge is an essential filtration component used in Sta-Rite System 3 modular media pool filters. Installed inside the filter housing, the cartridge traps debris and contaminants as water flows through the pleated filter media, helping maintain clear and balanced pool water.

This cartridge provides 136 square feet of filtration area and functions as the smaller inner element in the S7M400 System 3 filter configuration. The durable polyester media is engineered to capture fine particles while maintaining strong water flow and long cleaning cycles. Replacing worn or clogged cartridges restores proper circulation and filtration efficiency, helping maintain optimal pool water clarity and system performance.