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Search filters, cartridges or a SKU Cart, 0 items 0
  • Whole house
  • Drinking water
  • Shower and bath
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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
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  • Document Center
  • YouTube channel
Help and support
  • Help center
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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
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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
  2. Search

Results for “reverse osmosis”

219 results

All Products Guides Pages

Guides

  • Guide · June 30, 2026

    Well Water vs City Water: What's Different and What Each One Needs

    Moved into a house with a well, or tired of that chlorine taste in town? Here is how well and city water really differ, and what each one needs.
  • Guide · June 11, 2026

    PFAS Water Testing: How to Check Your Water for Forever Chemicals

    You can't see, smell, or taste PFAS. Here's how to test your water the right way and what those tiny ppt numbers actually mean.
  • Guide · September 9, 2026

    Can Cats Drink Tap Water? Safety, Taste and Why Intake Matters Most

    Cornell puts a 10-pound cat's daily need at about a cup. Here is how your tap water changes what lands in the bowl, and what actually helps.
  • Guide · May 25, 2025

    How to Remove Hard Water: Solutions That Actually Work

    Vinegar only dissolves existing scale. Here's how to stop hard water minerals permanently, from point-of-use filters to whole-house softeners.
  • Guide · October 8, 2026

    Why Is My Water Softener Making Noise? What Each Sound Means

    Whirs, clicks and rushing water at night are a normal regeneration. Here's how to tell those apart from the sounds that mean a stuck valve or a repair.
  • Guide · June 18, 2026

    The Lead and Copper Rule: What It Requires and What It Means for You

    A plain-English guide to the Lead and Copper Rule Improvements: what your water system must do, the 2027 deadlines, and how to protect your tap now.
  • 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 · 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 · June 17, 2026

    Distilled vs Deionized Water: Which Do You Need?

    Both are highly pure, but distilled and deionized water are made differently and suited to different jobs. Here is how to choose the right one.
  • Guide · June 20, 2026

    How to Remove Chlorine From Water: 7 Methods Compared

    Chlorine keeps tap water safe in transit, but you do not need it at home. Compare 7 proven ways to remove chlorine and chloramine from your water.
  • Guide · July 18, 2026

    What Is Artesian Water? Source, Myths, and How It Compares

    The word artesian describes where water comes from, not how clean it is. Here is what artesian water really means for the water you drink.
  • 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 · October 6, 2026

    Membrane Fouling: Four Types, Warning Signs and How Pretreatment Prevents It

    Slow RO output, saltier water or a climbing pressure gauge? Find out which of the four foulants is to blame and how to keep it off your next membrane.
  • Guide · January 12, 2026

    How to Install & Wire Float Switches to a Whole House RO System

    Float switches protect your whole house RO system from overflow and pump damage. This guide covers mounting float switches to your storage tank and wiring them to both the RO system and...
  • 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 · July 28, 2026

    Catalytic Carbon Explained: The Media Built for Chloramine and Rotten-Egg Odor

    Standard carbon can't fully handle chloramine or sulfur smell. Here's how catalytic carbon works and how to tell if your water needs it.
  • Guide · July 23, 2026

    How Does a Private Well Work? A Homeowner's Guide

    Own a well or about to? Here is the plain-English walkthrough of how a private well moves water from the aquifer to your kitchen tap, part by part.
  • Guide · September 14, 2026

    How to Size a Commercial Water Softener: Grains, Flow and Twin Tanks

    A softener can carry enough grains and still fall short at peak flow. Here's the two-check method, with worked numbers, for choosing a commercial model.
  • 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 · July 14, 2026

    Bottled Water vs Filtered Water: Cost, Quality, and Health Facts

    Ounce for ounce, bottled water is one of the priciest, least regulated ways to drink. See how filtered tap water compares on cost, quality, and health.
  • Guide · September 15, 2026

    In-Home Water Test Demonstrations: What They Really Show

    A kitchen water demonstration can make almost any tap water look bad. Here's the chemistry behind each one and what a real water test looks like.
  • 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 · 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.
  • Guide · September 7, 2026

    Chlorine Injection vs Hydrogen Peroxide: Continuous Dosing for Well Water

    Chlorine leaves a residual that protects downstream. Peroxide oxidizes faster and adds no taste. Here is how to pick, and how to stage it.
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