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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
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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 “reverse osmosis”

382 results

All Products Guides Pages

Collections

    Best match

    Products

    • Granular Activated Carbon Water Filtration System, 15 GPM automatic, white tank with black control head and black base

      Granular Activated Carbon Water Filtration System

      From $1,829.99

      5.0 (1)
    • 36 GPM Ultraviolet Water Sterilizer, stainless steel chamber with two lamp ports on a stand with control panel

      36 GPM Ultraviolet Water Sterilizer System

      $2,069.00

      UV system

    • 3-Stage Big Blue Whole House Filter, three blue housings with black caps on a wall bracket with two pressure gauges

      3-Stage Whole House Water Filter | Big Blue

      From $789.99

      Whole house system

    • Eagle Redox Alloy 9500, close-up of dark brown and black granules

      Eagle Redox Alloy® 9500 (per pound)

      $21.75

      5.0 (2)
    • Anion Exchange Resin, close-up of cream and tan spherical resin beads

      Anion Exchange Resin

      From $212.50

      Part # CQE-RM-05019

    • Nitrate Removal SMART Single Countertop Filter, white polypropylene housing with chrome faucet and diverter hose

      Nitrate Removal | SMART Single Cartridge Countertop Water Filter System

      From $99.00

      Countertop water filter

    • Acid Neutralizing Water Filtration System, 15 GPM automatic, white tank with black control head and black base

      Acid Neutralizing Water Filtration System

      From $1,929.99

      Commercial system

    • 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

    • Spot-Free Car Wash Filter, single blue Big Blue housing with pressure gauge on white system stand

      Spot-Free Car Wash Filter - Portable Deionizing Water Filter

      From $297.00

      Inline water filter

    • SMART Arsenic Removal Pitcher Cartridge, single lavender cartridge with mesh-window top, front view

      SMART/Arsenic Removal Water Pitcher Cartridge

      $21.00

      4.7 (9)
    • Eagle Arsenic Oxide media, close-up of brown granules with Crystal Quest logo overlay

      Eagle Arsenic Oxide

      From $352.50

      5.0 (1)
    • 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

    • Ceramic Countertop Water Filter System, single white polypropylene housing on a white base with chrome faucet and diverter hose

      Ceramic Countertop Water Filter System

      From $86.90

      5.0 (1)
    • 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

    • Premium Coconut Shell GAC, close-up of black granular activated carbon

      Premium Coconut Shell GAC

      From $72.50

      Part # CQE-RM-05000

    • Iron Filter Cartridge, 2-7/8 x 9-3/4 inch single yellow cartridge with lavender-banded label, front view

      Iron Filter Cartridge

      $49.00

      4.9 (8)
    • Turbidity Removal Water Filtration System, 15 GPM automatic, white tank with black control head and black base

      Turbidity Removal Water Filtration System

      From $1,929.99

      Commercial system

    • Inline water filter, white housing on a wall bracket with a SMART PLUS Filter Cartridge label

      Voyager Single Inline Water Filter System

      From $119.00

      5.0 (1)
    • 60 GPM Ultraviolet Water Sterilizer, multi-lamp stainless steel chamber on a stand with digital control panel

      60 GPM Ultraviolet Water Sterilizer System

      $2,969.00

      UV system

    • Lead Under Sink Water Filter System, single white filter housing on a white wall bracket with gooseneck drinking faucet

      Lead Under Sink Water Filter System

      From $182.90

      5.0 (2)
    • Double inline water filter system, two labeled white filter housings on a white wall bracket

      Voyager Double Inline Water Filter System

      From $134.00

      Inline water filter

    • Alkalizing + SMART Single Under Sink System, white housing with mounting bracket and separate silver faucet

      Alkalizing + SMART Single Under Sink Water Filter System

      $182.90

      Under sink water filter

    • 2-in-1 Combo Shower Filter and Bath Ball Bundle, white shower filter with fixed and handheld heads, cartridges, Bath Ball

      2-in-1 Combo Shower Filter and Bath Ball® Bundle

      From $203.90

      5.0 (2)
    • Eaglesorb Turbidity Removal, close-up of tan granular media

      Eaglesorb Turbidity Removal

      From $127.50

      Part # CQE-RM-05009

    Previous page 1…910111213…16 Next page
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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.

    Fresh water begins here®

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    Shop

    • Whole home
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    • All home systems

    Specialty filters

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

    Replacement filters

    • Replacement cartridges
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    • Filter media and resin
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    For business

    Commercial and industrial

    • Search by industry
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