iSpring FM15B iron-manganese reducing cartridge for home filtration.
WGB21BM compatible housing with FM15B replacement cartridge.
FM15B catalytic media close-up for durable filtration.
FM15B installed in a residential filter housing delivering clearer water.
iSpring whole-house filtration setup ready to reduce mineral content.

iSpring

iSpring FM15B Iron & Manganese Reducing Replacement Filter for WGB21BM Whole House System

High-performance tools and home improvement made for confident daily results

$88.19

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Why customers choose TaskHolt Tools

Meet the iSpring FM15B iron and manganese reducing cartridge, a purpose-built 10x4.5 inch replacement designed for whole-house filtration setups such as the iSpring WGB21BM. It sits in line where your home's water first enters, helping to curb visible mineral content and support cleaner-looking water across taps, appliances, and laundry.

Compatibility and design you can trust

  • Reduces iron from up to 3.0 ppm to 0.01 ppm and manganese from up to 1.0 ppm to 0.01 ppm, based on typical service conditions.
  • Fits 10" x 4.5" cartridges and works with most whole-house systems that use this size, including WGB21BM.
  • Engineered with durable catalytic media that sustains performance without being consumed in the process.

Performance you can feel in daily use

  • Efficient flow with higher linear velocities, delivering 4–8 GPM while maintaining a manageable 5 psi drop at 8 GPM; suitable for common household needs.
  • Operates across a broad range of water conditions: feed water pressure 20–100 psi, pH 5.8–8.6, and temperatures of 40–113°F.
  • Long media life, with an expected capacity of up to 30,000 gallons at a 3.0 ppm iron level before replacement is recommended.

Quality, safety, and support you can rely on

  • Manufactured to FDA standards and independently tested to NSF/ANSI benchmarks for water quality and material safety.
  • Register online to activate an extended manufacturer warranty and enjoy lifetime U.S. technical support.
  • Designed to be installed with confidence in residential settings, providing a practical approach to water filtration.

Note: Real-world results depend on your water chemistry and usage patterns. The FM15B is intended to reduce iron and manganese levels and improve overall water handling for households on compatible 10x4.5 filter systems.

FAQ

Q: What does the FM15B cartridge do, and is it compatible with my WGB21BM system?

A: FM15B reduces iron and manganese in home water and fits 10x4.5 inch filtration systems like WGB21BM.

Q: How long does the FM15B cartridge last, and what factors affect replacement timing?

A: Typically up to 30,000 gallons at 3.0 ppm iron; performance depends on water chemistry and daily usage.

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