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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
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    • Bundles
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  • By problem

    • Rotten egg smell
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    All contaminants

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    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
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    Cartridges and media

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    RO membranes and components
    • Under sink RO membrane
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    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.

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    Industries

    • Agriculture and farming
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    • Multi-residential
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    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
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    • FHA and VA loan test
    All water tests

    Test collections

    • Specialty tests
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    • Contaminant-specific tests

    Single contaminant tests

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

    Free tools

    • Water hardness by ZIP
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    • Water report analyzer
    • Lead in water lookup
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    Compare your lab results with EPA limits.

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  • Explore our hubs

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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
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  • Under-sink reverse osmosis
  • Under sink
  • Countertop
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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.

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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.

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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
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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 · September 19, 2026

    Saltwater Intrusion in Well Water: Signs, Testing and What to Do

    A rising chloride number tells you more than a salty taste. Here's how coastal well owners can test for saltwater intrusion, read the results and respond.
  • Guide · October 5, 2026

    Radium and Gross Alpha in Well Water: Reading the Result and What Removes It

    A low gross alpha result can still hide radium-228. Here's how the radioactivity lines on a well report fit together and which treatment takes radium out.
  • Guide · July 19, 2025

    How to Choose the Best PFAS Water Filter for Your Home

    Which PFAS filter actually works? We break down the three technologies that remove forever chemicals, and what to look for before you buy.
  • Guide · June 23, 2026

    How to Flush a New Water Filter (and What's Normal During Break-In)

    Gray water, cloudiness, or an odd taste from a brand new filter is usually normal break-in. Here is how to flush it out and when something is actually wrong.
  • Guide · June 22, 2026

    What Is an Air Gap in Plumbing? Dishwasher, RO, and Softener Protection

    An air gap is a simple plumbing device that stops contaminated water from flowing backward into your clean water supply. Here is how it protects your home.
  • Guide · April 8, 2026

    Pharmaceuticals in Water: What's in Your Tap and How to Remove It

    Pharmaceuticals are in your tap water. Learn what the EPA's 2026 action means, how drugs enter your water supply, and which filtration methods remove them.
  • Guide · April 28, 2026

    What Is RO Rejection Rate? (And How to Calculate Your System's)

    Wondering if your reverse osmosis system is still doing its job? Rejection rate is the one number that tells you, and you can check it yourself in five minutes.
  • Guide · July 16, 2026

    Does Boiling Water Actually Purify It?

    Boiling kills bacteria and viruses, but for lead, nitrate, and PFAS it does nothing, or makes them worse. Here's the real breakdown of boiling vs filtering.
  • Guide · July 10, 2026

    Waterborne Diseases: What They Are and How to Prevent Them

    The CDC estimates about 7.15 million waterborne illnesses in the US each year. Here are the common ones, their symptoms, and the filtration that stops each.
  • Guide · September 19, 2026

    What Does Water Taste Like? What You're Really Tasting in a Glass

    Minerals, disinfectant and your pipes shape how water tastes. Decode your water's flavor with EPA and WHO taste levels, and learn when a taste needs a test.
  • Guide · July 3, 2025

    PFAS in Tap Water: What It Is, Why It Matters, and How to Remove It

    Nearly half of US tap water contains PFAS forever chemicals. Find out if your water is affected and which filtration systems actually remove them.
  • Guide · June 24, 2026

    RO vs UV vs UF: Which Water Treatment Do You Actually Need?

    RO, UV, and UF are not competitors. RO handles dissolved solids and chemicals, UV disinfects, and UF strains out particles. Here is how to pick.
  • Guide · June 20, 2026

    Disinfection Byproducts in Drinking Water: Are They Safe?

    That swimming-pool smell in your tap water is chlorine, and it leaves behind disinfection byproducts. Here is what they are and how to lower them.
  • Guide · July 14, 2026

    How to Remove Boron From Water (and Why It's So Hard)

    A water manufacturer's guide to why boron resists standard filtration, and the pH-adjusted RO and boron-selective ion exchange methods that actually reduce it.
  • Guide · June 29, 2026

    Does Purified Water Have Minerals? What You Need to Know

    Most purification methods remove minerals from water, but not all of them, and the health impact may be smaller than you think. Here is the full picture.
  • Guide · July 19, 2026

    Commercial Ice Machine Water Filtration: Stopping Scale, Cloudy Cubes, and Downtime

    Your ice machine keeps failing, but the culprit usually isn't the machine. It's the water. Here's how the right filtration stops scale and cloudy ice.
  • Guide · September 13, 2026

    Restaurant Water Filtration Systems: Matching Treatment to Every Kitchen Line

    Your dish machine, combi oven and soda fountain each want different water. Here's how to map treatment to each line and size it to how the kitchen runs.
  • Guide · June 25, 2026

    Nitrates in Drinking Water: Risks, Sources, and How to Remove Them

    Nitrates in Drinking Water: What You Need to Know Nitrate is one of the most common contaminants in private well water, and it gives away nothing. It has no color, no smell,...
  • Guide · June 13, 2026

    The Environmental Impact of Bottled Water (and What to Do About It)

    One liter of bottled water can hold about 240,000 plastic particles, and most bottles are never recycled. Here is a cleaner way to drink.
  • Guide · July 17, 2026

    Silica in Water: What It Is and How to Remove It

    Silica in water is harmless to drink but tough on fixtures, water heaters, and RO membranes. Here's why it matters and how to remove it from your home's water.
  • Guide · September 22, 2026

    How to Clean a Countertop Ice Maker and Stop Scale From Coming Back

    Countertop ice makers keep the water they don't freeze, and its minerals stay behind. The full clean, plus the fill habits that stop the crust.
  • Guide · June 29, 2026

    Copper in Drinking Water: Health Risks, Causes, and How to Remove It

    Those blue-green stains and that metallic taste usually trace back to copper from your own pipes. Here is what causes it and how to get it out.
  • Guide · July 29, 2025

    Taking Care of Your RO System in 5 Minutes a Month (Easy Guide)

    Reverse osmosis maintenance simplified into three easy intervals: a 5-minute monthly check, a once-a-year sanitize, and filter swaps every two to three years. The beginner-friendly version of our complete maintenance guide.
  • Guide · June 29, 2026

    Coconut-Free Water Filters: Carbon Options and Allergy Facts

    Can You Get a Water Filter Without Coconut-Shell Carbon? Yes, you can get a water filter without coconut-shell carbon, and Crystal Quest can build one for you. Much of the activated carbon...
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  • Eco friendly

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  • Built in the USA

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

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