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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.

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    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
    • 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
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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
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    • Educational articles Guides and how-tos
    • Video resources Watch and learn
    Articles by topic
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    • Custom manufacturing
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    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”

219 results

All Products Guides Pages

Guides

  • Guide · July 1, 2026

    Does Hot or Cold Water Help Acid Reflux? What Actually Works

    Find out whether hot or cold water helps acid reflux, and why the pH and quality of your water may matter even more than temperature.
  • Guide · October 7, 2026

    How to Install an Under-Sink Water Filter: Faucet, Valve, Tubing and Flush

    Three connections, two decisions and one warranty check: what installing an under-sink cartridge filter really takes, from the faucet hole to the first flush.
  • Guide · May 28, 2025

    Why Water Hardness Matters: Hidden Costs, Health Effects, and How to Fix It

    Hard water costs you more than you think. Learn how it impacts your energy bills, appliances, skin, hair, and the environment.
  • Guide · June 27, 2025

    How Do Water Softeners Work? Ion Exchange Explained

    Water softeners use ion exchange to remove calcium and magnesium from your water. Here's the full process, from resin beads to regeneration.
  • Guide · May 21, 2025

    10 Signs You Have Hard Water (and How to Fix It)

    White scale on your faucet is just the beginning. Here are 10 signs your home has hard water and what you can do about it.
  • Guide · July 25, 2026

    Ceramic Water Filters: How They Work, What They Remove, and How to Choose

    A ceramic water filter physically blocks bacteria, cysts, and sediment. Here is how they work, exactly what they remove, and how to choose the right one.
  • Guide · July 4, 2026

    How Much Water Should You Drink on Creatine?

    Creatine raises your daily water needs. Learn how much to drink by body weight, how loading changes it, and why quality matters at high volume.
  • Guide · July 17, 2026

    Is Alkaline Water Good for You? What the Science Actually Says

    Some alkaline water claims hold up and some are pure marketing. Here is what the science supports, plus the smartest way to get it at home.
  • Guide · May 16, 2025

    Hard Water 101: Causes, Effects & Fixes - A Complete Breakdown

    Discover exactly what hard water is, how it forms, why it hurts your plumbing, skin and wallet.
  • Guide · March 31, 2026

    Do Salt-Free Water Softeners Work? Complete Guide (2026)

    Salt-free water softeners prevent scale but don't truly soften water. Learn how NAC and TAC conditioners work, compare salt-free vs. salt-based systems side by side, and find the right system for your...
  • Guide · September 16, 2026

    Is Rainwater Safe to Drink? What It Takes to Make Roof Water Drinkable

    What a drinkable rainwater system needs, from roof material and first flush diversion to filtration, pH correction, UV disinfection and regular testing.
  • Guide · September 15, 2026

    Radon in Well Water: What Your Result Means and When to Treat It

    A water radon number only makes sense next to your air test. Here's the 10,000-to-1 rule, what three states advise, and how aeration and carbon compare.
  • Guide · July 1, 2026

    How Long Does Bottled Water Last? Shelf Life, Safety, and Smarter Alternatives

    Sealed bottled water is safe long past its date, but the plastic is another story. How long it really lasts, how to store it, and a smarter way to hydrate.
  • Guide · June 29, 2026

    Is Your Well Water Safe After Flooding or Heavy Rain? What to Do, in Order

    Is Well Water Safe After Flooding? Not Until You Check It and Test It If your well was flooded or sat under standing water after heavy rain, treat the water as unsafe...
  • Guide · July 6, 2026

    Water Softener Bypass Valve: How to Use and Fix It

    How to Use a Water Softener Bypass Valve (For Every Valve Type) Your water softener needs to come offline, and you still need water flowing to the rest of the house. Maybe...
  • Guide · June 18, 2026

    Are Water Filters Worth It? Budget vs Professional Systems

    A budget pitcher and a whole-house system solve different problems. Here is how to match the filter to your water, your home, and your long-run cost.
  • Guide · September 11, 2025

    What Is Anion Exchange Resin? Types, Uses, and Selection

    Technical overview of anion exchange resin: how it works, Type I vs II (SBA/WBA), silica/CO₂ performance, EBCT and regeneration, and key applications.
  • Guide · September 17, 2026

    Buying a House With a Well? The Water Test to Order Before Closing

    Lender and state rules, the tests worth adding, who collects the sample, and your options if the well water fails before closing.
  • Guide · June 15, 2026

    Water Softener Leaking? How to Find the Source and Fix It

    A leaking water softener usually points to one of a few specific parts. Here is how to find where the water is coming from and what to do next.
  • Guide · September 12, 2026

    Why Is My Water Brown, Yellow or Rusty? How to Read the Color

    Color tells you where the problem is, not how dangerous it is. Here is the triage that separates a hydrant flush from your water heater from your well.
  • Guide · July 18, 2026

    How Much Water Should You Drink a Day? (It Depends)

    The Truth About How Much Water You Should Drink a Day You've probably heard it a thousand times: drink eight glasses of water a day. But that rule has no real scientific...
  • Guide · July 21, 2026

    UV Water Filter Lamp Replacement and Maintenance: A Complete Guide

    Your UV lamp can keep glowing for months after it has stopped disinfecting. Here is how to replace it, clean the sleeve, and keep the system doing its job.
  • Guide · July 22, 2026

    Is Lemon Water Good for You? 10 Science-Backed Benefits

    Lemon water offers real benefits: vitamin C, hydration, kidney stone prevention, and more. Here are 10 science-backed reasons to drink it, plus side effects.
  • Guide · September 11, 2026

    Commercial Laundry Water Treatment: The Water Spec for Laundromats and OPL

    Soft water saves detergent. That's not a spec. Here are the numbers to hold, the contaminant that stains linen, and how to size to peak machine draw.
Previous page 1…78910 Next page
  • 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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