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Crystal Quest Water Filters
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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

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Articles by topic
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  • Filtration systems
  • Contaminants
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Company
  • About us
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  • 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

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  • 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

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  1. Home
  2. Search

Results for “water softener”

172 results

All Products Guides Pages

Guides

  • Guide · June 5, 2025

    Water Softener Maintenance: Complete Homeowner Checklist

    Keep your water softener running at peak performance. Monthly checks, brine tank cleaning, resin care, salt selection, and troubleshooting.
  • Guide · September 16, 2026

    Water Softener Loop: Which Lines Should Get Soft Water?

    Hot only, whole house, or everything but the kitchen cold tap? See what each softener layout covers, what it leaves hard, and what to do without a loop.
  • Guide · June 5, 2025

    Water Softener vs Water Conditioner: Which Do You Need?

    Compares how Softeners and Conditioners work, cost, their economic impact, and maintenance.
  • Guide · May 23, 2025

    Do You Need a Water Softener? 8 Signs of Hard Water

    White crusty buildup, soap that won't lather, dry skin, spotty dishes. If you recognize these signs, your home has hard water. Learn what to look for and what to do about it....
  • Guide · June 14, 2026

    Water Softener Troubleshooting: Diagnose and Fix Common Problems

    When soft water disappears, the fix is usually simple. Here is how to find the cause, from salt bridges to worn-out resin, and when to call a pro.
  • Guide · July 20, 2026

    Water Softener vs Water Filter: Which One Do You Actually Need?

    A softener fights scale and spots. A filter removes contaminants like chlorine and lead. Here is how to tell which your home needs, or if you need both.
  • Guide · July 7, 2026

    Best Water Softener Systems for Your Home (2026 Guide)

    Hard water quietly wears down pipes, appliances, skin, and hair. Here is how to choose the water softener that actually fits your home.
  • Guide · July 6, 2026

    Water Softener Bypass Valve: How to Use and Fix It

    How to Use a Water Softener Bypass Valve (For Every Valve Type) Your water softener needs to come offline, and you still need water flowing to the rest of the house. Maybe...
  • Guide · September 17, 2026

    Tankless Water Heater Scale Prevention: Softener, Conditioner or Flush?

    Your hardness number and your heater's manual decide whether flushing is enough or a softener or salt-free conditioner should go in front of the heater.
  • Guide · June 21, 2026

    How to Install a Water Softener: A Step-by-Step Guide

    Installing a water softener is a doable weekend project. Here is where to put it, how to connect the bypass and drain, and how to start it up right.
  • Guide · April 6, 2026

    Best Water Softener Salt: How to Choose the Right Type

    Not all softener salt is the same. Here's how to pick the right type for your water hardness, system, and budget.
  • Guide · June 15, 2026

    Water Softener Leaking? How to Find the Source and Fix It

    A leaking water softener usually points to one of a few specific parts. Here is how to find where the water is coming from and what to do next.
  • Guide · September 20, 2026

    Water Softener Rental vs Buying: The Real Break-Even Math

    A rental quote looks like a phone bill until you multiply it out. Run the break-even math on your own numbers, and find out what the monthly fee actually covers, before you...
  • Guide · July 8, 2026

    Water Softener Control Valves: Clack vs Fleck vs Autotrol Compared

    Which control valve should run your softener? An honest Clack vs Fleck vs Autotrol comparison from a 30-year manufacturer, with sizing help.
  • Guide · July 22, 2026

    How Much Does a Water Softener Cost? A 2026 Price Breakdown

    How Much Does a Water Softener Cost? You're standing in the store aisle, looking at a wall of water softeners, and the prices swing from a few hundred dollars to well past...
  • 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 · October 8, 2026

    Water Softener Settings: What to Set Hardness, Reserve and Regeneration Time To

    Three or four numbers run your softener. Here's how to work out each one from a water test, with a worked example and Vtrol control head steps.
  • 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 27, 2025

    How Do Water Softeners Work? Ion Exchange Explained

    Water softeners use ion exchange to remove calcium and magnesium from your water. Here's the full process, from resin beads to regeneration.
  • Guide · July 8, 2026

    Water Softeners and Septic Tanks: What the Research Actually Says

    The research is clear: an efficient water softener is safe for a healthy septic system, and its discharge may even improve your drain field. Here is the science.
  • Guide · March 31, 2026

    Do Salt-Free Water Softeners Work? Complete Guide (2026)

    Salt-free water softeners prevent scale but don't truly soften water. Learn how NAC and TAC conditioners work, compare salt-free vs. salt-based systems side by side, and find the right system for your...
  • Guide · September 21, 2026

    Are Salt Water Softeners Banned Where You Live? How to Check

    Some sewer agencies stop new salt softeners because plants can't remove chloride. How to check your address, why potassium isn't a loophole, and what works.
  • Guide · July 25, 2026

    Why Does Soft Water Feel Slippery? The Science of Softened Water

    That slick, silky feeling after a new softener isn't soap residue. It's a sign your water is doing exactly what softened water should.
  • Guide · June 26, 2026

    Is Softened Water Safe to Drink? Sodium Levels Explained

    Your water softener swaps hard minerals for a little sodium. Here is how much it adds, who should watch it, and how to get low-sodium water at the tap.
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