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Crystal Quest Water Filters
    • Whole house Filters every tap
    • Water softeners For hard water
    • Whole house RO RO for every tap
    • Under-sink reverse osmosis For drinking water
    • Under sink Fits under the sink
    • Countertop Sits by the faucet
    • Shower and bath For shower and bath
    • Inline On a water line

    Whole house

    • Whole house Water filters
    • Whole house Reverse osmosis
    • Whole house Salt-based softeners
    • Whole house Salt-free conditioner
    • All salt-free conditioners
    • UV sterilization
    All residential systems

    Drinking water

    • Countertop
    • Inline
    • Under sink RO
    • Countertop RO
    • Reverse osmosis guide
    • Faucet mount system
    • Water pitcher
    All drinking water

    Specialty filtration

    • Acid neutralizing
    • Alkaline
    • Arsenic (whole house)
    • Radium and uranium
    • Silica
    • Sulfate
    • Tannins
    • Turbidity (cloudy water)
    All specialty filters

    More ways to filter

    • Shower and bath filters
    • Water coolers
    • Off-grid portable RO
    • Chemical dosing
    • Oxidation disinfection
    • Ozone disinfection
    • UV air sterilizer
    • Bundles
    • Gift card

    Not sure which system you need?

    Answer a few questions about your water and home to find the right system.

    Take the quiz

    Or try a focused quiz

    • Well water filter finder
    • Water softener quiz
  • By problem

    • Rotten egg smell
    • Pool smell or chlorine taste
    • Orange or rust stains
    • Black or brown stains
    • Blue-green stains
    • Cloudy water
    • Tea-colored water

    By contaminant

    • Arsenic
    • Fluoride
    • Lead
    • Iron, manganese and sulfur
    • Microplastics
    • Nitrate
    • PFAS
    All contaminants

    By water source

    • City water Chlorine, chloramine
    • Well water Iron and sulfur

    Where you live

    • Near a military base, airport or fire training site
    • Near a farm
    • Near the coast
    • Granite or mountain areas
    • Older home built before 1986

    How hard is your water?

    Enter your ZIP code to see the tap water hardness on record for your area.

    ZIP code Hardness on record Four levels Soft to very hard
    • Shower filter replacement cartridge
    • Bath Ball® replacement cartridge
    • Pitcher replacement cartridges
    • Filter cartridges
    • RO membranes
    • RO filter packs
    • UV bulbs & parts

    Cartridges and media

    • Replacement cartridges
    • Filtration media & resins
    • RO filter packs
    RO membranes and components
    • Under sink RO membrane
    • Low energy freshwater RO membrane
    • Brackish RO membrane
    • Desalination RO membrane
    • Membrane cleaners
    • RO parts and accessories
    • Water storage tanks
    Parts and equipment
    • UV bulbs & parts
    • Valve control heads
    • Pumps and motors
    Get help
    • Reorder from past orders
    • Find my filter
    • Subscribe and save
    • How often to change filters
    • When to replace a UV lamp
    • About RO membranes

    Find my filter

    Type the code printed on your cartridge.

    Common part numbers

    • Pitcher
    • CQE-RC-04002 SMART cartridge
    • CQE-RC-04000 Carbon block
  • Commercial and industrial

    Every system built to order

    Quotes on request, from a single inline filter to industrial reverse osmosis.

    Request a quote Opens in a new window. (800) 934-0051

    Industries

    • Agriculture and farming
    • Breweries
    • Cannabis cultivation
    • Commercial laundry
    • Food and beverage
    • Government and municipal
    • Medical and lab
    • Mining, oil and gas
    • Multi-residential
    • Plants and manufacturing
    • Schools and campuses
    • Service industries
    All industries

    Reverse osmosis

    • Brackish water RO
    • Seawater desalination
    • Medical-use RO
    • Dosing and pretreatment
    • Industrial RO
    • Industrial fresh water
    • Industrial brackish water
    • Industrial seawater
    Commercial RO

    Commercial systems

    • SMART systems
    • GAC systems
    • Inline systems
    • Ultrafiltration
    • Commercial softeners
    • Traditional softeners
    • Salt-free anti-scale
    • Demineralizers (DI)
    • Water stores

    Industrial

    • Industrial filtration
    • Nanofiltration
    • Industrial desalination
    • Ozone systems
    • Industrial UV
    • Chlorination
    • Industrial softeners
    • Industrial salt-free
    • Deionization
    • Wastewater reclamation
    • Containerized systems
    • Cartridge housings
    • Disaster relief
    Commercial/industrial specialty systems
    • Acid neutralizing (commercial)
    • Arsenic removal
    • Fluoride removal
    • Lead removal
    • Nitrate removal
    • Tannin removal
    • Turbidity removal
    • Iron, manganese, sulfide
    • Radium and uranium (commercial)
    • Sulfate removal
    • Silica removal
    • Alkalizer and mineralizer
  • Full water tests

    • City water test
    • Well water test
    • Radiological test
    • Complete RO water test
    • Problem check test
    • Waterborne pathogen panel
    • FHA and VA loan test
    All water tests

    Test collections

    • Specialty tests
    • Quick series tests
    • BART bacteria tests
    • Contaminant-specific tests

    Single contaminant tests

    • Lead test
    • Arsenic test
    • Fluoride test
    • Quick bacteria test
    • Nitrate and nitrite test
    • Radon test
    • Uranium test

    Free tools

    • Water hardness by ZIP
    • PFAS map
    • Water report analyzer
    • Lead in water lookup
    • Hardness converter
    • Softener size calculator
    All water tools

    Have a lab report?

    Compare your lab results with EPA limits.

    Analyze my report
  • Explore our hubs

    • Document Center
    • YouTube channel
    • Knowledge base Questions and answers
    • Educational articles Guides and how-tos
    • Video resources Watch and learn
    Articles by topic
    • Filtration systems
    • Contaminants
    • Filtration technology
    • Filter types
    • Applications

    Help and support

    • Help center
    • Order status
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    • Returns
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    • Submit a ticket Opens in a new window.
    • Contact us

    Company

    • About us
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    • Trustpilot reviews Opens in a new window.
    • Custom manufacturing
    • All business opportunities
    Need help? Get expert support from water filtration specialists (800) 934-0051 help@crystolquest.shop

    A water specialist can help you choose and care for your system, Monday to Friday, 9am to 5pm ET.

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  • Whole house
  • Water softeners
  • Whole house RO
  • Under-sink reverse osmosis
  • Under sink
  • Countertop
  • Shower and bath
  • Well water
  • Replacements

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Need help?(800) 934-0051

Finding a replacement?

Find the system you own, then confirm its replacement. A model or cartridge code helps.

Find replacements for my system Find your model or part number

Need help with your system?

For leaks or a system that is not working, send our team the model and a description of the problem.

Get product support Visit the Help Center

Try the code printed on your cartridge, a product name, or a problem like hard water. Or let us find it for you. Talk to a specialist

Popular searches

  • Shower filter
  • Whole house filter
  • High flow
  • Reverse osmosis
  • In-line refrigerator filter
  • Water softener

Popular replacements

See all replacements
  • Coconut Based 5-Micron Carbon Block cartridge From $22.95
  • SMART cartridge From $59.00
  • Shower Filter cartridge From $29.50
  • Bath Ball® cartridge From $39.50

Quick links

  • Check your water Hardness by ZIP code
  • Well water filter finder A short quiz that matches a system
  • Water test kits Lab tests for city and well water

Popular guides

  • How Often to Change Your Water Filter 14 min read
  • Whole House Water Filter Maintenance 11 min read
  • Hard Water 101 19 min read
  • How to Test Water Hardness at Home 6 min read

Common part numbers

  • CQE-RC-04000 Coconut Based 5-Micron Carbon Block cartridge
  • CQE-RC-04002 SMART cartridge
  • CQE-RC-04045 Shower Filter cartridge
  • CQE-RC-04052 Bath Ball® cartridge

  1. Home
  2. Search

Finding a replacement?

Find the system you own, then confirm its replacement. A model or cartridge code helps.

Find replacements for my system Find your model or part number

Need help with your system?

For leaks or a system that is not working, send our team the model and a description of the problem.

Get product support Visit the Help Center

Results for “in-line refrigerator filter”

337 results

All Products Guides Pages

Collections

    Best match

    Products

    • Nitrate Removal Water Filtration System, 20 GPM automatic, white tank with control valve beside black brine tank

      Nitrate Removal Water Filtration System

      From $3,379.99

      Commercial system

    • ORP Media, close-up of gray spherical media beads

      ORP Media (per pound)

      $19.75

      5.0 (1)
    • Commercial Water Softener System, 15 GPM, tall white resin tank with automatic control valve beside black brine tank

      Commercial Water Softener System

      From $2,989.99

      Water softener

    • Eagle Arsenic Oxide media, close-up of brown granules with Crystal Quest logo overlay

      Eagle Arsenic Oxide

      From $352.50

      5.0 (1)
    • 1 GPM Ultraviolet Lamp Bulb, short clear UV tube with pin connectors at both ends

      1 GPM Ultraviolet Lamp Bulb

      $79.95

      4.5 (2)
    • 10 inch Wrench for Under Sink and Countertop Housings, off-white plastic ring wrench

      10" Wrench (Under Sink/Countertop)

      $12.95

      5.0 (8)
    • Ionizer Multimedia, close-up of gray and white granules with white and reddish brown balls, Crystal Quest logo overlay

      Ionizer Multimedia

      From $138.00

      5.0 (1)
    • C6 3/8 inch tube countertop diverter valve, chrome body with lever handle and threaded collar

      C6 - 3/8" Tube Countertop Diverter w/Collar

      $19.95

      5.0 (1)
    • Eaglesorb Anti-Scale media, close-up of small white beads, Crystal Quest logo overlay

      Eaglesorb Anti-Scale (Per Liter)

      $107.00

      5.0 (2)
    • Mini CT Sediment Pre-Filter, clear bowl with stainless mesh screen on white body with threaded outlet

      Mini CT Sediment Pre-Filter

      $18.95

      5.0 (2)
    • 4-Inch Threaded Media Tank, 16 x 65 in white fiberglass tank with black base

      Water Filtration Media Tank - 4" Threaded

      From $699.00

      Tanks & Accessories

    • 1 Membrane Antiscalant - Membrane Antiscalant - Scientific World Products

      Membrane Antiscalant (Liquid)

      From $129.00

      5.0 (1)
    • S-150 RO System Control Panel, white enclosure with digital display and blue, green and red buttons

      S-150 Commercial/Industrial Reverse Osmosis System Control Panel

      From $3,400.00

    • 4" x 40" RO Membrane Housing, stainless tube with two black end caps, O-ring, clamps and screws

      4" x 40" RO Membrane Housing with Cap,O-rings and Lock included

      $399.95

      Part # CQE-PT-03230

    • Acid Neutralizing/pH Enhancing Mix, close-up of gray and white crushed granules

      Acid Neutralizing/pH Enhancing mix

      From $87.50

      Part # CQE-RM-05025

    • 1/4 inch Quick Connect, white push-fit fitting with blue collet, black O-ring and threaded end

      1/4" Quick Connect

      $4.95

      4.0 (2)
    • 4" x 40" Brackish Water Reverse Osmosis Membrane, white wrapped element with label, angled view

      4" x 40" Brackish Water Reverse Osmosis Membrane

      From $354.81$549.93 Sale

      5.0 (1)
    • C-100 Reverse Osmosis System Control Panel, white panel with digital display, green and blue buttons and status LED chart

      C-100 Reverse Osmosis System Control Panel

      $2,589.00

      Control panel

    • Sulfate Removal Water Filtration System, manual upflow, white fiberglass tank with black top cap beside a black brine tank

      Sulfate Removal Water Filtration System

      From $3,579.99

      Commercial system

    • Easy Fill Media Funnel, wide black funnel with handle tab and Crystal Quest logo, side view

      Easy Fill Media Funnel

      From $12.95

      Tanks & Accessories

    • Hybrid Ultrafiltration Bottleless Water Cooler, white and blue floor standing unit with hot and cold taps, front view

      Hybrid Ultrafiltration Bottleless Water Cooler

      $764.00

      Bottleless water cooler

    • Calcite (Calcium Carbonate), close-up of light gray and white crushed granules

      Calcite (Calcium Carbonate)

      From $57.50

      Part # CQE-RM-05008

    • OxiOrg O3 Pro Ozone Laundry System - Ozone Laundry System - Crystal Quest®

      OxiOrg O³ Pro Ozone Laundry System

      $549.00

    • C-200 Commercial RO System Control Panel, wall enclosure with LCD display and keypad, angled front view

      C-200 Commercial/Industrial Reverse Osmosis System Control Panel

      From $7,400.00

      Control panel

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    • Eco friendly

      Protecting our planet through sustainable practices.

    • BPA free

      Toxin-free products that put your health and the environment first.

    • ISO 9001 certified

      Quality management for product quality, customer satisfaction and steady improvement.

      View certification (PDF, opens in a new tab)
    • Built in the USA

      Supporting American jobs and contributing to our nation's economic growth.

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    Specialty filters

    • PFAS
    • Fluoride
    • Lead
    • Arsenic
    • Iron and sulfur
    • Microplastics
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    • All contaminants

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    For business

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