Stainless Steel Undersink Replacement Filter Pack (4-stage)

• Complete two-filter replacement pack:
  Includes the filtration cartridges needed for
  compatible earlier four-stage undersink systems.
• Advanced filtration:
  Combines specialized nanofiber filtration
  with premium carbon block technology.
• Broad contaminant reduction:
  Designed to address a range of unwanted
  substances found in drinking water.
• Fine particle filtration:
  Nanofiber technology helps capture
  bacteria, cysts, and ultrafine particles.
• Improved taste and odor:
  Carbon block filtration helps reduce
  chlorine, chemical tastes, and odors.
• Mineral preservation:
  Retains naturally occurring dissolved
  minerals, including calcium and magnesium.
• City and well water compatibility:
  Designed for compatible systems using
  either water source, with performance
  dependent on incoming water conditions.

This replacement pack contains two filtration
cartridges for your existing Greenfield
undersink system.

Stage 1 — Advanced Nanofiber Filtration

Advanced electropositive nanofiber technology
designed to capture bacteria, viruses, cysts,
and ultrafine particles while maintaining
strong water flow.

This filtration stage is designed to address
a range of unwanted substances, including
certain PFAS compounds, lead, fluoride,
VOCs, and emerging contaminants,
depending on the specific filter media
and operating conditions.

Stage 2 — Carbon Block Polishing Filtration

Premium activated carbon block filtration
helps reduce chlorine, chemical tastes,
and odors while providing additional
water quality refinement.

Together, these two filtration cartridges
provide complementary contaminant reduction
while preserving naturally occurring
dissolved minerals.

Please note:
The structuring and energizing device
is a permanent component of the original
system and does not require routine replacement.

The filtration technologies used in this
replacement pack are selected for their
complementary approaches to contaminant
reduction and drinking water quality.

Advanced Nanofiber Filtration

Specialized electropositive filtration
media are designed to capture extremely
fine particles and certain microbial
contaminants while maintaining
strong water flow and low pressure drop.

Carbon Block Filtration

High-quality activated carbon filtration
provides additional chemical contaminant
reduction and helps improve drinking
water’s taste and odor.

Manufacturer technical documentation
provides information about filtration
capabilities under defined conditions.
Actual performance can vary depending
on incoming water quality, contaminant
concentrations, flow rate, and
household usage.

Nanofiber Filter Performance Data (PDF)

An optional inline mineralizer is
available for customers who prefer
additional mineral enrichment
or a different drinking water
taste profile.

Greenfield filtration systems are
designed to preserve naturally
occurring dissolved minerals,
including calcium and magnesium.
The mineralizer is therefore
an optional addition rather than
a required component.

If your system includes an inline
mineralizer, please refer to the
installation instructions below.

Inline Mineralizer Manual (PDF)

For optimal performance, we generally
recommend replacing your undersink
filtration cartridges approximately
every 6–12 months,
depending on water quality and usage.

Larger households or homes with
higher water consumption will often
benefit from replacement closer to
every 6–8 months,
while smaller households with
lighter usage may be able to
go longer.

Incoming water quality, sediment
levels, contaminant concentrations,
and overall system usage can all
influence replacement frequency.

These recommendations reflect
our experience supporting Greenfield
filtration systems in real-world
household conditions.

Use the following resources for
filter replacement, installation,
and system sanitization.

Filter Replacement Manual (PDF)

Filter Replacement Video Guide

System Sanitizing Guide (PDF)

Questions about filter replacement,
system compatibility, or maintenance?
Our team is happy to help.