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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

    Systems for your project

    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
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    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
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  • 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”

172 results

All Products Guides Pages

Guides

  • Guide · July 13, 2026

    Ozone Water Treatment: What It Removes and How It Works

    Ozone destroys bacteria, cyanotoxins, iron, and odor compounds through oxidation, then reverts to oxygen and leaves no chlorine-type residual. Here is how it works.
  • Guide · June 26, 2026

    Chromium-6 in Drinking Water: Health Risks and How to Remove It

    The Erin Brockovich chemical is still in many US water supplies. Here is what hexavalent chromium does to your health and how to filter it out.
  • 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 14, 2026

    Why Does My Tap Water Taste Salty, Chalky, or Metallic This Summer?

    Your water tasted fine in spring. Here is what a hot, dry summer changes at the tap, and which taste points to which fix.
  • Guide · June 23, 2026

    How to Install a Whole House Water Filter: DIY or Hire a Plumber?

    DIY or hire a plumber? Here is how whole house water filter installation works, what to ask an installer, and how Crystal Quest supports any plumber.
  • 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 · July 29, 2025

    Complete RO System Maintenance Guide: Keep Your Water Pure for Years

    Keep your reverse osmosis system delivering pure water for years. This guide covers monthly checks, filter changes, sanitization, and membrane replacement for both point-of-use and whole house RO setups.
  • Guide · July 16, 2026

    Types of Water Explained: Spring, Artesian, Mineral, Purified, and Distilled

    A plain-language guide to every type of water, sorted by where it comes from and what has been done to it, plus how to choose.
  • 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 · December 28, 2025

    Hard Water and Your Skin: The Hidden Cause of Dryness, Irritation, and Dull Hair

    Your expensive skincare routine might be fighting a losing battle. If you have hard water, minerals are damaging your skin and hair faster than products can repair them.
  • Guide · September 22, 2026

    How Is Tap Water Treated? From the Plant to Your Faucet

    Your city treats water in a few steps, then sends it through miles of pipe. What each step does, what it leaves behind and how to check your own utility.
  • 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 · 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 · June 18, 2026

    How to Keep Pipes From Freezing (And Protect Your Water Filtration System)

    Frozen pipes and filter housings crack, leak, and flood homes every winter. Here are eight proven ways to protect your plumbing and water system before the cold.
  • Guide · August 5, 2025

    How Does Ultrafiltration Work? A Guide to UF Water Filtration

    Ultrafiltration strains out bacteria, cysts, and particles without stripping the minerals your water already has. Here's how UF works and where it fits.
  • 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 · September 28, 2026

    Black Specks in Your Water: What They Are and How to Find the Source

    Five causes, three questions, about two minutes at the sink. Start with whether it is the hot water only, the cold, or just one tap.
  • Guide · June 10, 2026

    Boil Water Advisory: What It Means and Exactly What to Do

    Boil notices hit DC, St. Louis, and Kansas in one June week. Here is exactly what to do when one hits your town, including the filter step most people miss.
  • Guide · June 18, 2026

    Water Filter Micron Ratings: How to Choose (and When to Step Up)

    Micron ratings, explained: what each level catches, why finer is not always better, and whether your sediment filter is really what dropped your water pressure.
  • Guide · April 29, 2025

    Whole House Water Filtration: How Point-of-Entry Systems Protect Every Tap

    A whole house water filter treats water at the main line before it reaches any faucet, shower, or appliance. Learn what POE systems remove, how different filter types work, and how to...
  • Guide · June 30, 2026

    Why Does My Stomach Hurt After Drinking Water? Causes and Fixes

    Stomach pain after drinking water is more common than you think. Here is what causes it, from drinking habits to water quality, and how to fix it.
  • Guide · June 17, 2026

    UV Water Purification: How It Works and When You Need It

    Germicidal UV light neutralizes bacteria, viruses, and parasites in seconds, no chemicals added. See what UV removes and how to size it for well or city water.
  • Guide · May 6, 2025

    Arsenic in Drinking Water: Health Risks, Testing, and How to Remove It

    Arsenic is invisible in water and classified as a Group 1 carcinogen. Learn how it enters your water, how to test for it, the difference between Arsenic III and V, and which...
  • Guide · September 21, 2026

    Should You Cook With Filtered Water? When It Matters and When Tap Is Fine

    Rice and soup keep nearly all their cooking water; pasta mostly drains it. How lead, nitrate, chlorine and hard water change what your kitchen needs.
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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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