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Search filters, cartridges or a SKU Cart, 0 items 0
  • Whole house
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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

Resources and help

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Help and support
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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

Made in USA. Free shipping on residential orders over $150 within the lower 48 US states

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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

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  1. Home
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Results for “high flow”

151 results

All Products Guides Pages

Guides

  • Guide · July 25, 2025

    How to Replace a Reverse Osmosis Membrane

    Over time, RO membranes clog or wear out. This guide walks through how to remove and replace your reverse osmosis membrane so your system keeps performing at its best.
  • 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 · June 15, 2026

    Water Filter Troubleshooting: Fix 10 Common Problems Fast

    Slow flow, off taste, or a leak under the sink? Most water filter problems trace back to three simple causes you can fix yourself in minutes.
  • Guide · May 29, 2025

    Salt-Free Water Conditioner Maintenance: Complete Guide

    Salt-free conditioners are low-maintenance, not zero-maintenance. Here's your complete schedule for filters, media, flushing, and troubleshooting.
  • Guide · September 29, 2021

    What is a Wastewater Treatment System and How Does it Work?

    A plant manager's guide to how industrial wastewater treatment systems actually work, from screening through reuse, with the regulatory framework that shapes every design decision.
  • Guide · July 19, 2026

    Boiler Feed and Cooling Tower Water Treatment: Controlling Scale and Hardness in Building Systems

    Hardness and dissolved solids scale up boilers and cooling towers, raising fuel and water bills. Here's how softening, RO, and blowdown control protect them.
  • Guide · July 26, 2026

    Spot-Free Car Wash Water: How RO and DI Eliminate Rinse Spots

    Those white spots after a rinse are dried minerals, not a drying problem. Here is how deionized and RO water leave a car spot-free, and how to size a system.
  • Guide · July 17, 2024

    Understanding Tannins in Drinking Water

    Understanding Tannins in Drinking Water: The Complete Guide You turn on the faucet and the water looks like weak tea. It might have a faint yellow tinge, a deep amber hue, or...
  • Guide · June 18, 2026

    Sediment Filter for Well Water: Pleated vs Spin-Down

    Sand, silt, and rust ride in with well water. Here is how a sediment filter protects your home, and how to choose between spin-down and pleated.
  • Guide · July 17, 2026

    How to Size a Commercial Reverse Osmosis System (GPD, Recovery, and Feed Water)

    Turn a vague water need into a real gallons-per-day spec. A manufacturer walks through peak demand, recovery, feed-water derating, and pre-treatment.
  • Guide · July 1, 2026

    Best Under-Sink Water Filter: How to Choose the Right System

    A manufacturer's guide to choosing an under-sink water filter: cartridge vs reverse osmosis, media by function, avoiding proprietary lock-in, and fit.
  • Guide · February 14, 2023

    Membrane Technology in Multistage Filter Systems

    Not all multistage water filters are equal. Learn how membrane type, stage count, and system design determine what your filter actually removes.
  • 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 · June 13, 2025

    NAC Media: The Science Behind Salt-Free Water Conditioning

    Technical deep dive into NAC (Nucleation Assisted Crystallization): the chemistry, operating specs, NAC vs TAC, and Eaglesorb ES3 details.
  • 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 · June 12, 2026

    Whole House PFAS Water Filter: The Complete Guide

    One system at your main line can take forever chemicals out of every tap. How whole house PFAS filtration works and when you actually need it.
  • 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 · 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 21, 2026

    What Size Whole House Reverse Osmosis System Do You Need?

    Cold well water can cut an RO membrane's output by close to half. How to size the system, storage tank and delivery pump for your household.
  • Guide · July 25, 2026

    How to Choose a Shower Filter: Types, Media, and What Each One Removes

    A water filter maker's guide to picking a shower filter: in-line vs showerhead, KDF vs carbon vs vitamin C, and matching the filter to your water.
  • 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 · June 25, 2026

    Tankless vs Tank Reverse Osmosis: Which RO System Is Right for You?

    On-demand or storage tank? A clear, no-hype look at how tankless and tank reverse osmosis systems differ, and how to match one to your kitchen.
  • Guide · October 9, 2026

    Silt Density Index (SDI): How the Test Works and the Number Your RO Needs

    SDI puts a number on the fine particles headed for an RO membrane. Here's how the 15-minute test works, how to do the math and what to do with a high reading.
  • Guide · July 17, 2026

    Water Filtration for Coffee Shops and Espresso Bars: Hitting the Specialty Water Standard

    Why Water Is the Ingredient You Are Not Tasting A brewed coffee is roughly 98 percent water, and even a concentrated espresso is still overwhelmingly water. So the water running into your...
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