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Crystal Quest Water Filters
    • Whole house Filters every tap
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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

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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

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

  1. Home
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Results for “water softener”

172 results

All Products Guides Pages

Guides

  • Guide · March 23, 2026

    How to Find the Best Water Filtration System for Every Tap in Your Home

    From whole house systems to under-sink RO, this guide covers every type of water filtration, the technologies behind them, and how to match the right system to your home's specific water quality....
  • Guide · June 19, 2026

    10 Benefits of Water Filtration (And How to Choose the Right System)

    Filtration closes the gap your utility leaves behind, cutting contaminants like lead and PFAS that meet legal limits but you would rather not drink.
  • 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 · July 4, 2026

    Can Dogs Drink Tap Water? What Every Owner Should Know

    Is your tap water safe for your dog? A clear look at the contaminants that matter, why small dogs are more exposed, and easy ways to upgrade the bowl.
  • 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.
  • 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 · September 3, 2026

    Legionella Water Management Plans: ASHRAE 188, CMS, and Where Treatment Fits

    CMS requires hospitals and nursing homes to keep a written water management plan, but not the testing most vendors sell. Here is what the rules actually say.
  • Guide · July 2, 2024

    Lead in Drinking Water: How It Gets In, Health Risks, and How to Remove It

    6 to 10 million American homes still have lead service lines. Learn how lead enters your water, what the health risks are, how to test, and which filtration methods actually remove it....
  • Guide · August 25, 2025

    Pennsylvania's Water Quality Crisis: What Every Resident Needs to Know in 2025

    PFAS, lead, and runoff are straining Pennsylvania's water systems. Here is what is in the water, what it means for your family, and how to protect your home.
  • Guide · October 4, 2026

    Why Is My Tap Water Cloudy? The Glass Test and What Each Result Means

    Fill a clear glass and watch it. Clearing from the bottom up means air; staying cloudy means particles worth checking. Here is what each result means.
  • Guide · July 7, 2025

    How to Detect PFAS in Tap Water: 5 Warning Signs You're at Risk

    PFAS can't be seen, smelled, or tasted. Learn the five risk factors that suggest PFAS contamination and exactly how to test your water for forever chemicals.
  • Guide · March 18, 2026

    Shower Filter Skin Benefits: How Filtered Water Transforms Your Skin Health

    Your skincare routine might be working against you, not because of your products, but because of your water. Here's the science behind shower filter skin benefits.
  • Guide · September 14, 2026

    Uranium in Well Water: Reading Your Test Result and What to Do Next

    Uranium can't be seen or tasted, so the lab number is all you have. Here's how to read it, what else to test, and how much of the house to treat.
  • 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 · June 22, 2026

    Will It Fit? Water Filter System Dimensions and Clearance to Check Before You Buy

    Capacity tells you if a system is enough water. This guide covers the other half: whether it physically fits your space and the path to get it there.
  • Guide · June 21, 2026

    Why Does My Well Water Smell Like Rotten Eggs? Causes, Testing, and How to Fix It

    That rotten egg smell in your well water is hydrogen sulfide gas. Here is how to find the source and clear it, from the water heater to the well.
  • Guide · March 18, 2026

    How to Test Your Water at Home: What to Look For and What to Do About It

    Testing your water is the best way to protect your family and your home. Learn what to look for, how to test, and what to do about the results.
  • Guide · October 6, 2026

    Orange Rust Stains From Iron in Water: How to Remove Them and Stop Them Coming Back

    Orange marks under drips and around drains usually mean iron. Here's what removes them from each surface, what makes them worse and when to test your water.
  • 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 · December 26, 2025

    Limescale: The Expensive Problem Hiding in Plain Sight

    That white crust on your faucets is just the beginning. Discover what hard water is really costing you, and the permanent solution.
  • Guide · January 2, 2026

    Why Your Laundry Feels Stiff and Your Colors Are Fading

    You're not imagining it, your towels really are getting scratchier and your colors really are fading faster. Hard water neutralizes half your detergent before it ever touches your clothes.
  • Guide · June 2, 2026

    What is Cation Exchange Resin?

    How cation exchange resin works: SAC vs WAC, its two roles in water softening and deionization, regeneration, and how to choose the right grade.
  • Guide · January 2, 2026

    Why Your Glasses Come Out of the Dishwasher Spotted and Cloudy

    You open the dishwasher expecting sparkling glasses. Instead, they're covered in white spots and cloudy film. The problem isn't your dishwasher, it's your water.
  • Guide · September 26, 2026

    How Iron and Sulfur Filters Work: Air Injection, Catalytic Media, Greensand and Chemical Injection Compared

    Four families of iron and sulfur filter, one decision. How each one oxidizes and filters, and the test numbers that pick between them.
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