PUREPLUS RFN20BB 5-Micron 20x4.5-Inch Whole House Iron & Manganese Removal Cartridge

Cleaner water for every tap

The PUREPLUS RFN20BB cartridge is engineered to address iron and manganese in domestic water. By targeting common well-water contaminants, it helps convert harsh, metallic tastes and appearances into clearer, more inviting water across your home. While performance varies with water quality, the filter is designed to reduce iron levels from up to 3.0 ppm to near trace levels and manganese from up to 1.0 ppm to near trace levels, contributing to a noticeably improved water experience.

Built as a durable, reusable resin granule filter, this cartridge works within PUREPLUS 20" x 4.5" whole-house systems and is compatible with models such as FM25B, RFFE20-BB, and CFRFFE-20BB. The design emphasizes reliable filtration that supports everyday household needs—from the kitchen faucet to the bathroom sink—without requiring separate point-of-use units.

What makes it reliable

• Rigorous materials and testing: ISO 9001 production standards, 34 processing steps, a 400 PSI pressure test, 10,000 water-hammer tests, and 6 independent evaluations to ensure consistency and durability.
• High-performance resin granules: The inner reusable filter can be rejuvenated, and the resin can be soaked in salt water for about 12 hours to help restore its iron and manganese-reducing capability.
• Long-term value: Expect 6 months of use or up to 4,000 gallons before replacement, whichever comes first, offering a cost-effective way to maintain water quality over time.

Usage, maintenance, and care

Designed for whole-house filtration, this cartridge is ideal as part of a 3-stage protection system for well water. It provides professional filtration performance to support a healthy water supply for the entire family, applying a balance of filtration efficiency and ease of maintenance. When used together with compatible PUREPLUS filters, it contributes to cleaner, better-tasting water across multiple outlets.

• Maintenance-friendly: The inner resin is reactivatable via simple salt-water soaking, potentially extending the life of the cartridge.
• System compatibility: Specifically designed for PUREPLUS 20" x 4.5" whole-house filtration setups and compatible 3-stage configurations.

Important notes on installation and compatibility

Suitable as a replacement for FM25B, RFFE20-BB, CFRFFE-20BB, and other compatible PUREPLUS configurations. When paired with related filters, it supports a cohesive filtration solution designed for the entire home, with a focus on reducing iron and manganese through a durable, tested cartridge format.