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Crystal Quest Water Filters
    • Whole house Filters every tap
    • Water softeners For hard water
    • Reverse osmosis For drinking water
    • Under sink Fits under the sink
    • Shower & bath For shower and bath
    • Whole house RO RO for every tap
    • Countertop Sits by the faucet
    • 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 softeners
    • 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

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    • Chemical dosing
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    • Bundles
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    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
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  • 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
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    • Microplastics
    • Nitrate
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    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
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    • 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 codeHardness on record Four levelsSoft to very hard
    • Shower filter replacement cartridge
    • Bath Ball® replacement cartridge
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    • Filter cartridges
    • RO membranes
    • RO filter packs
    • UV bulbs & parts

    Cartridges and media

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    Find my filter

    Type the code printed on your cartridge.

    Common part numbers

    • CQE-RC-04047 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.

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    • Schools and campuses
    • Service industries
    All industries

    Reverse osmosis

    • Commercial RO
    • Brackish water RO
    • Seawater desalination
    • Medical-use RO
    • Dosing and pretreatment
    • Industrial RO
    • Industrial fresh water
    • Industrial brackish water
    • Industrial seawater
    All 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
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    Need help? Get expert support from water filtration specialists (800) 934-0051 help@crystalquest.com

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

Search filters, cartridges or a SKU Cart, 0 items 0
  • Whole house
  • Drinking water
  • Shower and bath
  • Softeners
  • Well water
  • Replacements
Crystal Quest Water Filters
Search filters, cartridges or a SKU
Water filters

Menu Water filters

Water filters

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

Shop by category

  • Whole house Filters every tap
  • Water softeners For hard water
  • Reverse osmosis For drinking water
  • Under sink Fits under the sink
Whole house
  • Whole house Water filters
  • Whole house Reverse osmosis
  • Whole house Salt-based softeners
  • Whole house Salt-free conditioner
  • All salt-free softeners
  • 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
Water problems

Menu Water problems

Water problems

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

Replacements

Menu Replacements

Replacements

  • Shower filter replacement cartridge
  • Bath Ball® replacement cartridge
  • Pitcher replacement cartridge
  • Filter cartridges
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
  • All RO membranes
Parts and equipment
  • Shop all parts
  • UV bulbs & parts
  • Valve control heads
  • Pumps and motors
  • Parts directory
Get help
  • Help center
  • Reorder from past orders
  • Find my filter
  • Subscribe and save
  • How often to change filters
  • When to replace a UV lamp
  • About RO membranes
Commercial & industrial

Menu Commercial & industrial

Commercial & 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.
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
Reverse osmosis
  • Commercial RO
  • Brackish water RO
  • Seawater desalination
  • Medical-use RO
  • Dosing and pretreatment
  • Industrial RO
  • Industrial fresh water
  • Industrial brackish water
  • Industrial seawater
  • All commercial RO
Commercial systems
  • SMART systems
  • GAC systems
  • Inline systems
  • Ultrafiltration
  • Commercial softeners
  • Traditional softeners
  • Salt-free anti-scale
  • Demineralizers (DI)
  • Water stores
Commercial/industrial specialty systems
  • All 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
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
Water testing

Menu Water testing

Water testing

Have a lab report?

Compare your lab results with EPA limits.

Analyze my report
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
  • Lead in water lookup
  • Hardness converter
  • Softener size calculator
  • All water tools
Resources and help

Menu Resources and help

Resources and help

  • Knowledge base
  • Educational articles
  • Video resources
  • Document Center
  • YouTube channel
Help and support
  • Help center
  • Order status
  • Manage subscription
  • Returns
  • Warranty
  • Installation guides
  • Submit a ticket Opens in a new window.
  • Contact us
Articles by topic
  • All articles
  • Filtration systems
  • Contaminants
  • Filtration technology
  • Filter types
  • Applications
Company
  • About us
  • Reviews
  • Trustpilot reviews Opens in a new window.
  • Custom manufacturing
  • All business opportunities
Need help? Get expert support from water filtration specialists
  • Talk to a specialist(800) 934-0051, Mon to Fri, 9am to 5pm ET
  • Email ushelp@crystalquest.com

Made in USA. Free shipping on residential orders over $150 within the lower 48 US states

Find my system Call

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

Common part numbers

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

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

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

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Results for “water softener”

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  • Page

    Arsenic In Your Drinking Water

    The need for safe, healthy water is critical to all human life. The substances that water dissolves can be unhealthy or even toxic. These substances can also ruin expensive plumbing fixtures and...
  • Page

    Guardian Series Whole House Water Filters

    Guardian Series Whole House Water Filters Crystal Quest Guardian Series Whole House Water Filter Systems are designed and manufactured for outstanding service and are ideal for treating a variety of different water...
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    Commercial Turbidity Removal Water Filtration Systems

    Commercial Turbidity Removal Water Filter Systems Crystal Quest® Commercial Turbidity Removal Filtration Systems are designed and manufactured for outstanding service and are ideal for treating a variety of different water problems. Utilizing...
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    Commercial Acid Neutralizing Water Filtration Systems

    Commercial Acid Neutralizing Water Filter Systems Crystal Quest® Commercial Acid Neutralizing Systems are designed and manufactured for outstanding service and are ideal for treating a variety of different water problems. Utilizing the...
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    Commercial Lead Removal Water Filter Systems

    Commercial Lead Removal Water Filter Systems Crystal Quest® Commercial Lead Removal Systems are designed and manufactured for outstanding service and are ideal for treating a variety of different water problems. Utilizing the...
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    Video Resource Center | Crystal Quest Water Filters

    Video Resource Library Learn Water Filtration From the Experts Step-by-step installation guides, product walkthroughs, and expert education from Crystal Quest's 40+ years of water treatment experience. 25+ Videos 4 Categories 40+ Years...
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    Whole House Water Filters Make Staying Hydrated Simple

    Live free from wondering what's in the water coming out of your home's faucets. Help protect your health, and your budget, and reduce your carbon footprint with proper water filtration for your home. Whole...
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    Commercial Reverse Osmosis Water Filters for Medical-Use

    Lab & Medical Water Purification MEMBRANE TECHNOLOGY + MEDIA FILTRATION + ULTRAVIOLET ADD-ON AND MORE OPTIONAL UPGRADES Transforming Healthcare with Advanced Medical Water Filtration Solutions Step into the realm of advanced medical...
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    Water Hardness Converter (ppm, gpg, °dH) - Instant Results

    Water Hardness Converter - Crystal Quest Hardness Direct Ca & Mg Report Total Hardness Value Unit ppm (mg/L as CaCO₃) Grains per Gallon (gpg) German Degrees (°dH) French Degrees (°fH) mmol/L Calcium...
  • Page

    Comparison Chart for EAGLE® Series Whole House Water Filters

    EAGLE® 1,000  MID-SIZE + ALKALIZER EAGLE® 2,000  WHOLE HOUSE + ALKALIZER EAGLE® 4,000  WHOLE HOUSE + ALKALIZER + SALTLESS CONDITIONER  Filters Water to Achieve a Balanced pH Achieves Alkalinity* (Higher pH)  Softens Water...
  • Page

    Best Well Water Filtration Systems - Remove Iron, Bacteria & Contaminants

    Well Water Filtration Systems Complete Protection for Your Home Professional-grade well water treatment systems starting at $572. Remove iron, bacteria, sulfur, tannins, sediment, and harmful contaminants with Crystal Quest's proven filtration technology...
  • Page

    Quick FAQ's about Smart & Eagle Systems

    What is the difference between a balanced pH and enhanced pH? The pH of pure or balanced water is very close to 7. Acidic water has a pH less than 7 and...
  • Page

    Natural Alkalizer, Ionizer, Mineralizer and Oxidation Cartridge

    In Stage 1 - water flows through pre one - micron filter pads (1 micron equals 1/25,000th of an inch), which remove suspended particles such as silt, sediment, cyst (Giardia, Cryptosporidium), sand, rust,...
  • Page

    Tools, Calculators and Resources

    Free Tools and resources: DI Resin Capacity Calculator DI for Auto Detailing: Calculate how many cars can be washed  Water Hardness Conversion Calculator: Convert hardness from TDS to GPG and more Water...
  • Page

    Tannin Removal Whole House Systems

      TANNIN REMOVAL WHOLE HOUSE SYSTEM TANNIN REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  TANNIN + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  TANNIN + SMART SERIES WATER FILTER + SOFTENER WHOLE HOUSE SYSTEM  REMOVES TANNIN FROM YOUR DRINKING WATER...
  • Page

    Turbidity Removal Whole House Comparison Chart

      TURBIDITY REMOVAL WHOLE HOUSE SYSTEM TURBIDITY REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  TURBIDITY + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  TURBIDITY + SMART SERIES WATER FILTER + SOFTENER WHOLE HOUSE SYSTEM  REMOVES TURBIDITY FROM YOUR DRINKING...
  • Page

    Acid Neutralizing Whole House Comparison Chart

      ACID NEUTRALIZER WHOLE HOUSE SYSTEM ACID NEUTRALIZER + SOFTENER WHOLE HOUSE SYSTEM  ACID NEUTRALIZER + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  ACID NEUTRALIZER + SMART SERIES WATER FILTER + SOFTENER...
  • Page

    Arsenic Removal Whole House Comparison Chart

    ARSENIC REMOVAL WHOLE HOUSE SYSTEM ARSENIC REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  ARSENIC REMOVAL + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  ARSENIC REMOVAL + SMART SERIES WATER FILTER + SOFTENER WHOLE HOUSE SYSTEM   REMOVES...
  • Page

    Nitrate Removal Whole House Systems

      Nitrate REMOVAL WHOLE HOUSE SYSTEM Nitrate  REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  Nitrate + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  Nitrate  + SMART SERIES WATER FILTER + SOFTENER WHOLE HOUSE SYSTEM  REMOVES Nitrate FROM YOUR DRINKING WATER...
  • Page

    Iron, Manganese & Hydrogen Sulfide Removal Whole House Comparison Chart

      FE, MN, H2 S REMOVAL WHOLE HOUSE SYSTEM FE, MN, H2 S REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  FE, MN, H2 S + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  FE, MN, H2 S + SMART SERIES WATER...
  • Page

    Comparison Chart for SMART Systems

      SMART COMPACT SMART WHOLE HOUSE  SMART WHOLE HOUSE + SOFTENER FILTERS WATER TO ACHIEVE A BALANCED PH  ACHIEVES ALKALINITY ** SOFTENS WATER HARDNESS (CONDITIONER) WELL WATER  CITY WATER  STAGES OF FILTRATION 8 5...
  • Page

    Fluoride Removal Whole House Comparison Chart

      FLUORIDE REMOVAL WHOLE HOUSE SYSTEM FLUORIDE REMOVAL + SOFTENER WHOLE HOUSE SYSTEM  FLUORIDE REMOVAL + SMART SERIES WATER FILTER WHOLE HOUSE SYSTEM  FLUORIDE REMOVAL + SMART SERIES WATER FILTER + SOFTENER WHOLE HOUSE SYSTEM  REMOVES INORGANIC FLUORIDE...
  • Page

    Commercial & Industrial Systems for All Service Industries

     Spas Resorts & Hotels Country Clubs Nail Salons Hair Salons Pet Groomers Car Washes Laundromats Airline Companies Water Parks Carpet Cleaning Services and a multitude of others! Benefits Sought:   Marketing value   Cleaner service   No...
  • Page

    What is Deionization and How does it Work?

    What Is Deionization (DI)? Ion exchange for ultra‑low conductivity water DI resin removes dissolved mineral ions from water using ion exchange. In deionization, a cation resin (H⁺ form) replaces positive ions (Ca²⁺,...
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