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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
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    • 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
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    Help and support

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    • Submit a ticket Opens in a new window.
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    • 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 “Water softener”

210 results

All Products Guides Pages

Collections

    Best match

    Products

    • 2.5" x 14" Freshwater Reverse Osmosis Membrane, white wrapped element with black end caps and label, angled view

      2.5" x 14" Freshwater Reverse Osmosis Membrane

      $153.75

      Part # CQE-RC-04111

    • Infra-Red Balls, close-up of orange red balls in mixed sizes, Crystal Quest logo overlay

      Infra-Red Balls (per pound)

      $17.90

      5.0 (2)
    • Radiological Water Test, foam cooler, white sample bottles and small open box with sample pouch

      Radiological Water Test

      From $179.00

      Water test kit

    • Tourmaline Balls, close-up of reddish brown ceramic spheres in mixed sizes, Crystal Quest logo overlay

      Tourmaline Balls (per pound)

      $16.90

      5.0 (2)
    • Membrane Preservative, 1.5 pound white jug with yellow product label, front view

      Membrane Preservative

      From $49.00

    • 3/4 inch Pressure Regulator, black and gray cylindrical regulator body

      3/4" Pressure Regulator

      $55.00

      5.0 (1)
    • Dual Iron Test water sample bottle with yellow cap and blue ice pack

      Fluoride Test

      $69.00

      Water test kit

    • Fluoride Mix (Calcium GAC and Aluminum Oxide), close-up of black granules mixed with white and gold-colored particles

      Fluoride Mix (Calcium GAC & Aluminum Oxide)

      From $210.50

      Part # CQE-RM-05021

    • Dual Iron Test water sample bottle with yellow cap and blue ice pack

      Arsenic Test

      $69.00

      Water test kit

    • Dual Iron Test water sample bottle with yellow cap and blue ice pack

      Dual Iron Test

      $85.00

      Water test kit

    • 8" x 40" Freshwater Reverse Osmosis Membrane, light green fiberglass element with perforated cream end cap and label, angled view

      8" x 40" Freshwater Reverse Osmosis Membrane

      $598.25$675.00 Sale

      Part # CQE-RC-040862

    • 7000 GPD Whole House RO Filter Pack, four cartridges in white pleated, dark blue, teal and gray carbon block

      7000 GPD Whole House RO Filter Pack

      From $417.00

      Replacement cartridge

    • Water test kit, foam shipping cooler with lid, white sample bottle and blue ice pack

      Quick Nitrate & Nitrite Test

      $75.00

      Water test kit

    • Quest Micro-Blaster Air Disinfection Ozone System, 200 mg/h white wall unit with fan vent and Best Seller badge

      Residential Quest Micro-Blaster™ Air Disinfection Ozone System for Virus Disinfectant and Odor Eliminator

      From $89.00

      Ozone generator

    • Corrosion Check Water Test kit, foam cooler with lid, three sample bottles labeled first draw and flush, ice pack

      First Draw & Flush Dual Lead Test

      $85.00

      Water test kit

    • 1 inch Pressure Regulator, gray tee-shaped body with black end cap and threaded port

      1" Pressure Regulator

      $89.00

      Part # CQE-PT-03368

    • Quest Micro-Blaster UV-3000 Tabletop Ultraviolet Air Filtration System, white enclosure with fan, angled view

      Quest Micro-Blaster UV-3000 Tabletop Ultraviolet Air Filtration System

      $629.00

      Air purification

    • Digital TDS Meter, TDS-3 beige pen-style meter with LCD display and three pink buttons, front view

      Digital TDS Meter

      $27.45

      Water test kit

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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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    Specialty filters

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

    Replacement filters

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    Test and learn

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    For business

    Commercial and industrial

    • Search by industry
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