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Crystal Quest Water Filters
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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
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  • 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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Popular searches

  • Shower filter
  • Whole house filter
  • High flow
  • Reverse osmosis
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  • 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

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Results for “water softener”

172 results

All Products Guides Pages

Guides

  • 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 · July 15, 2026

    Questions to Ask Before You Approve a Water-Treatment Proposal

    A water-treatment proposal is a diagnosis, not just a price. Here is how to check it, stage by stage, against your own water report.
  • 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 · July 20, 2026

    What Kind of Water Should You Use in a Humidifier?

    Tap water leaves white dust on your furniture and scale in the tank. Here is which water to use in a humidifier, and how to make your own at home.
  • Guide · June 20, 2026

    How to Remove Iron From Well Water: Signs, Testing, and Treatment

    Orange stains, metallic taste, rusty slime? Here is how to identify the type of iron in your well water and choose a treatment that actually works.
  • Guide · June 21, 2026

    How to Increase Water Pressure in Your House: 8 Proven Fixes

    Weak showers and slow faucets usually have a fixable cause. Here are 8 proven ways to diagnose and increase your home water pressure, simplest first.
  • Guide · July 20, 2026

    Water Filter Cartridge Types Explained: Formats, Media, and Stages

    A plain-language map of every water filter cartridge type, sorted by housing size and by the media inside, so you can match the right cartridge to your water.
  • Guide · September 16, 2026

    Why Is My Water Bill So High? How to Find the Cause

    Before you dispute the bill, read your meter. Here's how to tell a hidden leak from seasonal use and spot equipment quietly sending water down the drain.
  • Guide · June 24, 2026

    What Is KDF Water Filter Media? How Redox Filtration Works

    Those three letters on a filter spec sheet stand for a copper-zinc media that handles chlorine and heavy metals differently than carbon. Here is what it does.
  • Guide · May 27, 2025

    What Causes Hard Water? 5 Natural Causes and How to Fix It

    That white scale on your faucet starts underground. Here's why your water is hard, what it costs you, and how to stop it.
  • Guide · March 17, 2023

    Cannabis Water Treatment: Commercial RO & Pre-Treatment for Wholesale Grows

    Commercial cannabis yields drift because of the one input most growers never control: source water. Here's how to spec RO and pre-treatment at scale.
  • Guide · September 22, 2026

    Does Hard Water Cause Hair Loss? What the Research Really Shows

    Finding more hair in the drain after a move? Here's what two lab studies found about hard water, and the more likely reasons hair falls out.
  • Guide · September 15, 2026

    How to Purify Water in an Emergency or Off the Grid

    Start with the cleanest water you can find, clear it, then kill the germs. How each emergency method works, and what none of them remove.
  • Guide · September 23, 2026

    How to Remove Sulfate From Well Water (And What Won't Touch It)

    Your softener will not touch sulfate. What EPA's two numbers mean, who is actually at risk, and the equipment that removes it.
  • Guide · January 2, 2026

    Why Your Water Pressure Is Dropping - What's Really Inside Your Pipes

    Your morning shower has been getting weaker for months. Inside your pipes, mineral scale is silently choking off your water flow and it's only getting worse.
  • Guide · August 22, 2025

    How to Test Your Well Water: A Complete Testing Guide

    If you're on a private well, nobody's testing your water but you. Here's exactly what to test for, how to collect a sample the right way, and how to read the results...
  • Guide · September 9, 2026

    Water Treatment for Breweries and Distilleries: A Production Spec Guide

    Municipal water is treated to be drinkable, not repeatable. A use-point guide to specifying brewery and distillery process water, from a manufacturer.
  • Guide · May 19, 2025

    TDS in Well Water: What It Means & How to Reduce It Safely

    Well water TDS levels can range from under 100 to over 3,000 ppm with no one monitoring them but you. Learn what causes high TDS in wells, when to worry, how to...
  • Guide · February 25, 2026

    Shower Filter Benefits: The Wellness Effects of Filtering Your Shower Water

    Most people install a shower filter for their skin or hair. They are expecting softer, healthier results. But the cumulative wellness effects often surprise them most.
  • Guide · August 28, 2026

    Upflow vs Downflow Whole-House Water Filters: Which Is Better?

    See how upflow and downflow water filters work, why backwash direction is a separate question, and which setup fits different water conditions.
  • 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 · 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 · 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.
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