CTO Coconut Shell Carbon Block Water Filter | 10″ & 20″

• Chlorine reduction:
  Designed to reduce chlorine
  and associated unpleasant
  tastes and odors.
• Premium coconut shell carbon:
  High-quality activated carbon
  provides effective adsorption
  of applicable contaminants.
• Improved water taste:
  Helps produce cleaner-tasting
  water for drinking, cooking,
  and everyday household use.
• Carbon block construction:
  Combines chemical adsorption
  with mechanical filtration
  of certain suspended particles.
• Consistent water flow:
  Engineered to balance
  filtration performance
  with practical flow rates.
• Reduced carbon fines:
  Designed to minimize loose
  carbon particles during
  initial flushing.
• Mineral preservation:
  Does not intentionally remove
  naturally occurring dissolved
  minerals such as calcium
  and magnesium.
• Versatile applications:
  Suitable for compatible
  residential and commercial
  pressurized filtration systems.
• Two convenient sizes:
  Available in standard
  10″ and 20″ slimline
  cartridge configurations.

Activated carbon is widely
used in water filtration
because of its ability
to adsorb certain
chemical contaminants.

Coconut shell activated
carbon contains a highly
porous structure with
a large internal
surface area.

As water passes through
the carbon block,
chlorine and certain
organic compounds interact
with the carbon surface
and are reduced through
adsorption and related
treatment mechanisms.

The compressed carbon
block structure also
provides mechanical
filtration for certain
suspended particles.

Why Coconut Shell Carbon?

Coconut shell activated
carbon is valued for
its microporous structure
and adsorption properties,
making it particularly
useful for chlorine
reduction and taste
and odor improvement.

Unlike reverse osmosis,
carbon block filtration
does not intentionally
remove most naturally
occurring dissolved minerals.

This CTO carbon block
is primarily designed
for chlorine reduction
and improved water
taste and odor.

Primary Filtration Applications

• Chlorine
• Chlorine-related tastes and odors
• Certain organic compounds
• Suspended particles within the cartridge’s filtration rating

NSF/ANSI 42 Testing:
The product’s supplied
performance information
describes independent
chlorine reduction testing
conducted in accordance
with NSF/ANSI 42 methods.

Testing to an NSF/ANSI
standard does not
necessarily mean the
cartridge is independently
certified to that standard.

Actual filtration performance
depends on cartridge size,
flow rate, incoming water
quality, contaminant
concentrations, and
operating conditions.

Important:
This cartridge is primarily
intended for chlorine,
taste, and odor reduction.
It should not be assumed
to provide validated
reduction of fluoride,
arsenic, PFAS, or
microbiological contaminants
without specific
supporting test data.

• Filtration Type:
  Activated carbon block
• Carbon Material:
  Coconut shell activated carbon
• Primary Function:
  Chlorine, taste, and odor reduction
• Micron Rating:
  Nominal 5–10 microns,
  depending on cartridge size
• Available Sizes:
  10″ and 20″
• Cartridge Diameter:
  Approximately 2.5″
• Operating Temperature:
  40°F–125°F
• Operating Pressure:
  20–125 psi, subject to
  the limitations of the
  complete filtration system
• Application:
  Compatible pressurized
  water filtration systems

Note:
Specifications may vary
by cartridge configuration.
Always confirm compatibility
with your existing
filter housing.

These carbon block
replacement cartridges
are available in two
standard slimline sizes.

10″ CTO Carbon Block

• Nominal length: 10″
• Diameter: Approximately 2.5″
• Fits compatible standard 10″ housings
• Suitable for applicable undersink and point-of-use systems

20″ CTO Carbon Block

• Nominal length: 20″
• Diameter: Approximately 2.5″
• Fits compatible standard 20″ slimline housings
• Suitable for applicable whole house and other filtration systems

Important:
These cartridges are not
interchangeable with
large-diameter Big Blue
or Big Block cartridges.

Please confirm your
existing cartridge
dimensions before ordering.

CTO carbon block cartridges
are designed for convenient
replacement in compatible
filter housings.

Installation Guidance

• Turn off the water supply before opening the housing.
• Relieve system pressure before removing the housing sump.
• Remove the existing cartridge and inspect the housing and O-ring.
• Install the new carbon block cartridge according to your system instructions.
• Reassemble the housing and check carefully for leaks.
• Flush the new cartridge before using the filtered water.

Initial Flushing:
Flush for approximately
5 minutes or according
to the cartridge
manufacturer’s instructions.

Initial flushing helps
remove loose carbon
fines and prepare
the cartridge for use.

Replacement Recommendation

We generally recommend
replacing the carbon block
every 6–12 months,
depending on water quality,
consumption, and
operating conditions.

Higher chlorine levels,
greater water consumption,
or increased particulate
loading may require
more frequent replacement.

Changes in taste or odor
may indicate reduced
carbon performance,
but should not be
used as the sole
indicator of
remaining filter capacity.

For additional information
about CTO carbon block
filtration technology,
technical specifications,
and available performance
documentation, please
review the brochure below.

View CTO Carbon Block Brochure

Manufacturer performance
documentation should
be interpreted according
to the specific cartridge
configuration and
testing conditions.

Testing of individual
cartridges does not
automatically establish
identical performance
for every installed
filtration system.

Both the 10″ and 20″
CTO carbon block filters
are currently in stock
and ship within one week.

If you’re unsure which
size is appropriate
for your filtration
system, our team
is happy to help.

Please provide your
existing cartridge
dimensions, system model,
or original order number
so we can confirm
compatibility.