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Crystal Quest Water Filters
    • Whole house Filters every tap
    • Water softeners For hard water
    • Whole house RO RO for every tap
    • Under-sink reverse osmosis For drinking water
    • Under sink Fits under the sink
    • Countertop Sits by the faucet
    • Shower and bath For shower and bath
    • Inline On a water line

    Whole house

    • Whole house Water filters
    • Whole house Reverse osmosis
    • Whole house Salt-based softeners
    • Whole house Salt-free conditioner
    • All salt-free conditioners
    • 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

    Not sure which system you need?

    Answer a few questions about your water and home to find the right system.

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    Or try a focused quiz

    • Well water filter finder
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  • 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
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    • Microplastics
    • Nitrate
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    All contaminants

    By water source

    • City water Chlorine, chloramine
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    Where you live

    • Near a military base, airport or fire training site
    • Near a farm
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    • 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.

    ZIP code Hardness on record Four levels Soft to very hard
    • Shower filter replacement cartridge
    • Bath Ball® replacement cartridge
    • Pitcher replacement cartridges
    • Filter cartridges
    • RO membranes
    • RO filter packs
    • UV bulbs & parts

    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
    Parts and equipment
    • UV bulbs & parts
    • Valve control heads
    • Pumps and motors
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    • How often to change filters
    • When to replace a UV lamp
    • About RO membranes

    Find my filter

    Type the code printed on your cartridge.

    Common part numbers

    • Pitcher
    • CQE-RC-04002 SMART cartridge
    • CQE-RC-04000 Carbon block
  • Commercial and 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. (800) 934-0051

    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
    All industries

    Reverse osmosis

    • Brackish water RO
    • Seawater desalination
    • Medical-use RO
    • Dosing and pretreatment
    • Industrial RO
    • Industrial fresh water
    • Industrial brackish water
    • Industrial seawater
    Commercial RO

    Commercial systems

    • SMART systems
    • GAC systems
    • Inline systems
    • Ultrafiltration
    • Commercial softeners
    • Traditional softeners
    • Salt-free anti-scale
    • Demineralizers (DI)
    • Water stores

    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
    Commercial/industrial 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
  • 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
    • Water report analyzer
    • Lead in water lookup
    • Hardness converter
    • Softener size calculator
    All water tools

    Have a lab report?

    Compare your lab results with EPA limits.

    Analyze my report
  • Explore our hubs

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    Articles by topic
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    • Custom manufacturing
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    Need help? Get expert support from water filtration specialists (800) 934-0051 help@crystolquest.shop

    A water specialist can help you choose and care for your system, Monday to Friday, 9am to 5pm ET.

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  • Whole house
  • Water softeners
  • Whole house RO
  • Under-sink reverse osmosis
  • Under sink
  • Countertop
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  • Well water
  • Replacements

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Need help?(800) 934-0051

Finding a replacement?

Find the system you own, then confirm its replacement. A model or cartridge code helps.

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Need help with your system?

For leaks or a system that is not working, send our team the model and a description of the problem.

Get product support Visit the Help Center

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

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

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

Common part numbers

  • CQE-RC-04000 Coconut Based 5-Micron Carbon Block cartridge
  • CQE-RC-04002 SMART cartridge
  • CQE-RC-04045 Shower Filter cartridge
  • CQE-RC-04052 Bath Ball® cartridge

  1. Home
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Finding a replacement?

Find the system you own, then confirm its replacement. A model or cartridge code helps.

Find replacements for my system Find your model or part number

Need help with your system?

For leaks or a system that is not working, send our team the model and a description of the problem.

Get product support Visit the Help Center

Results for “reverse osmosis”

219 results

All Products Guides Pages

Guides

  • 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 · April 29, 2025

    Whole House Water Filtration: How Point-of-Entry Systems Protect Every Tap

    A whole house water filter treats water at the main line before it reaches any faucet, shower, or appliance. Learn what POE systems remove, how different filter types work, and how to...
  • Guide · June 11, 2026

    PFAS Health Effects: What the Research Actually Shows

    What Are PFAS Health Effects? The EPA now considers a single drop of PFAS in 20 Olympic swimming pools worth regulating. That tells you how seriously the science is being taken, and...
  • Guide · July 4, 2026

    Can You Drink Distilled Water? Safety, Taste, and Smarter Options

    Half a jug left over from the humidifier? Here is whether distilled water belongs in your glass, where it really shines, and what to drink instead.
  • Guide · May 6, 2025

    Arsenic in Drinking Water: Health Risks, Testing, and How to Remove It

    Arsenic is invisible in water and classified as a Group 1 carcinogen. Learn how it enters your water, how to test for it, the difference between Arsenic III and V, and which...
  • 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 · August 26, 2025

    Nanofiltration for Water Softening: How It Works and When to Use It

    Nanofiltration is a salt-free, membrane-based way to soften water. Here's how it differs from ion exchange, RO, and TAC/NAC, and when it's actually the right choice.
  • 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 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 · June 25, 2026

    Do I Need a Water Filter? 10 Signs Your Tap Water Needs Help

    Your water is already telling you whether it needs a filter, if you know what to look for. Here are 10 warning signs and exactly what to do about each one.
  • Guide · May 24, 2025

    What Is a Good TDS Range? Ideal Levels for Taste, Health & Appliances

    Learn the best TDS range for great-tasting, safe water. EPA limits, taste chart, and how Crystal Quest RO and remineralizing filters hit the ideal ppm level.
  • Guide · June 14, 2026

    What Are Forever Chemicals? PFAS Explained

    Forever chemicals are everywhere, from nonstick cookware to tap water. Here is what PFAS actually are, why they never break down, and what you can do.
  • Guide · September 14, 2026

    Glyphosate in Drinking Water: Risks, Limits, Testing and Removal

    Detection isn't exceedance. What the monitoring data, EPA's 0.7 mg/L limit and the treatment research actually say about glyphosate in your water.
  • Guide · June 26, 2026

    How to Remove Manganese From Well Water

    Black stains on your sinks and laundry often point to manganese in your well water. Here is why it is trickier than iron, and how to get it out for good.
  • Guide · June 17, 2026

    UV Water Purification: How It Works and When You Need It

    Germicidal UV light neutralizes bacteria, viruses, and parasites in seconds, no chemicals added. See what UV removes and how to size it for well or city water.
  • 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 · June 13, 2026

    How Water Quality Affects Your Immune System

    Hydration supports immune function, but water quality matters too. Learn which contaminants are linked to immune concerns, who is most vulnerable, and when to test or filter.
  • Guide · March 22, 2026

    EPA RealWaterTA Initiative: What It Means for Your Drinking Water

    The EPA launched a new initiative to help water systems deliver cleaner, safer water - especially in rural areas. Here's what it means for your tap water at home.
  • 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 · 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 · 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 9, 2025

    How Carbon Filters Remove PFAS from Drinking Water - Simplified

    Can a carbon filter remove PFAS? Yes. Here's how it works, which types of carbon are most effective, and when you might need more than carbon alone.
  • 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 · July 8, 2025

    PFAS Water Filter Guide: How to Remove Forever Chemicals from Your Water

    Three filtration technologies can reduce PFAS by 90% or more. This guide covers which PFAS water filters work, which don't, and how to verify your system is performing.
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  • Eco friendly

    Protecting our planet through sustainable practices.

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    Toxin-free products that put your health and the environment first.

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    Quality management for product quality, customer satisfaction and steady improvement.

    View certification (PDF, opens in a new tab)
  • Built in the USA

    Supporting American jobs and contributing to our nation's economic growth.

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