Legacy Undersink Replacement Filter Pack (older systems)

• Complete replacement pack:
  Includes the cartridges needed for your
  selected earlier generation
  undersink filtration system.
• Upgraded advanced carbon block:
  Features a premium American made
  carbon block manufactured using
  100% coconut shell activated carbon,
  with a 0.5 micron nominal
  filtration rating.
• Broad contaminant reduction:
  Complementary filtration technologies
  selected to address chlorine,
  chloramine, certain heavy metals,
  PFOA/PFOS, VOCs, and other
  unwanted substances.
• Advanced nanofiber filtration:
  Electropositive filtration technology
  helps capture extremely fine particles,
  certain microorganisms, and other
  suspended contaminants.
• Improved taste and odor:
  Carbon filtration helps reduce chlorine
  and substances that affect drinking
  water’s taste and smell.
• Multiple housing options:
  Replacement configurations available
  for stainless steel, white, and
  clear filter housings.
• Optional mineral cartridge:
  Available for systems already equipped
  with an inline mineral cartridge.
• Mineral preservation:
  Standard carbon and nanofiber
  filtration stages retain naturally
  occurring dissolved minerals.
• Convenient maintenance:
  Recommended replacement approximately
  every 6–12 months, depending on
  household size, water quality,
  and overall usage.

Use the product dropdown menus above
to select the two options that match
your existing undersink system.

1. Select Your Housing Type

• Stainless Steel Housings
• White Housings
• Clear Housings

Choose the housing style currently
installed beneath your sink.
Different housing styles may require
different replacement cartridge
configurations.

2. Select Your System Configuration

• Standard:
  For systems without an inline
  mineral cartridge.
• Includes Inline Mineral Cartridge:
  For systems equipped with the additional
  inline mineral cartridge.

Not sure which options to select?
Contact our team before ordering.
A photo of your existing system
is often all we need to help
identify the correct replacement pack.

Your replacement pack includes the
appropriate cartridges for the housing
type and system configuration selected.

Standard Replacement Pack

• 1 Advanced Electropositive Nanofiber Cartridge:
  Uses specialized electropositive filtration
  technology to capture extremely fine
  particles and certain microorganisms
  while maintaining strong water flow.
• 1 Premium Carbon Block Cartridge:
  Activated carbon filtration helps reduce
  chlorine and other substances that affect
  drinking water’s taste and odor.
• 1 Upgraded Advanced Carbon Block Cartridge:
  Premium American made carbon block
  manufactured using 100% coconut shell
  activated carbon, with a 0.5 micron
  nominal filtration rating.
  Designed for complementary treatment
  of chlorine, chloramine, certain heavy
  metals, PFAS, VOCs, and other
  unwanted substances.

Replacement Pack with Mineral Cartridge

• 1 Advanced Electropositive Nanofiber Cartridge
• 1 Premium Carbon Block Cartridge
• 1 Upgraded Advanced Carbon Block Cartridge
• 1 Inline Mineral Cartridge

The inline mineral cartridge is
included only when the corresponding
system option is selected.

The upgraded advanced carbon block
replaces one of the previous carbon
filtration cartridges while retaining
the three-cartridge configuration
of the standard replacement pack.

These replacement packs combine
electropositive nanofiber filtration
with complementary activated carbon
technologies to address a broad
range of drinking water quality concerns.

Electropositive Nanofiber Filtration

Specialized electropositive filtration
media are designed to capture extremely
fine particles, including certain
bacteria, viruses, and cysts, while
maintaining strong water flow.

Premium Carbon Block Filtration

Activated carbon block filtration
provides treatment for chlorine,
taste, odor, and certain
chemical contaminants.

Upgraded Advanced Carbon Block Filtration

The updated replacement pack includes
a premium American made carbon block
manufactured using 100% coconut shell
activated carbon, with a 0.5 micron
nominal filtration rating.

Manufacturer performance data describes
applications involving chlorine,
chloramine, lead, mercury, PFOA/PFOS,
volatile organic compounds (VOCs),
and certain emerging contaminants.

The advanced carbon block’s materials
are certified to NSF/ANSI Standard 42
material requirements. This material
certification is distinct from
certification of specific contaminant
reduction claims.

Manufacturer and independent laboratory
performance information is available
in the technical documentation below.

Actual contaminant reduction and
filter service life depend on incoming
water chemistry, contaminant
concentrations, flow rate, contact
time, and household usage.

Performance data for individual
filtration media does not necessarily
establish verified reduction performance
for every contaminant in the complete
earlier generation undersink system.

Nanofiber Filtration Performance Data

Advanced Carbon Block Performance Data

Carbon Block Performance Data

For optimal performance, we generally
recommend replacing your undersink
filtration cartridges approximately
every 6–12 months.

Replacement frequency depends on
household size, water consumption,
incoming water quality, and
overall system 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.

For systems equipped with an inline
mineral cartridge, replacement
frequency may also depend on the
specific mineral media and its
recommended service life.

Changes in taste, odor, or water
flow may indicate that your filters
need attention, but these changes
are not reliable indicators
of every contaminant.

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

Not sure whether it’s time
to replace your filters?
Our Learning Center explains
the common signs to watch for
and the factors that influence
filter lifespan.

How to Tell When It’s Time to Replace Your Undersink Filters

Earlier Greenfield undersink systems
combine carbon and electropositive
nanofiber filtration technologies
that do not intentionally remove
naturally occurring dissolved minerals
such as calcium and magnesium.

Some earlier systems also include
an inline mineral cartridge
as an additional component.

If your existing system includes
an inline mineral cartridge,
select the corresponding replacement
pack option to receive that cartridge
alongside your filtration replacements.

The mineral cartridge is optional
and is not included with
standard replacement packs.

Our replacement and sanitization
guides are available to help
you maintain your earlier generation
Greenfield undersink system.

Before replacing filters, shut off
the incoming water supply and
relieve pressure from the system.

Follow the appropriate replacement
instructions for your housing type,
including proper cartridge positioning,
housing reassembly, and flushing.

Replacement Guide (PDF)

Sanitization Guide (PDF)

Questions about housing compatibility,
filter replacement, or maintenance?
Our team is happy to help you
find the correct replacement pack.