Point of Entry vs Point of Use Water Filters
Discover the key differences between POE and POU water filtration systems. Learn which approach is best for your home's water quality needs and budget.
Easily find expert advice, product guides, and water treatment insights—organized by topic to help you explore what matters most to your water filtration or education needs.
Browse all Crystal Quest articles by topic:
The CQ Water Blog
Pennsylvania is facing a growing water crisis. From PFAS “forever chemicals” to lead from aging pipes, contamination ...
The CQ Water Blog
2025 reverse osmosis pricing: countertop $100-$500; under‑sink $300-$1,000; whole‑house $5k-$12k. Includes install &a...
The CQ Water Blog
PFAS are turning up in tap water across the U.S. Learn what they are and why they're harmful.
The CQ Water Blog
Learn how water softeners use ion exchange to remove hardness minerals to eliminate scale, dry skin, and dull hair.
The CQ Water Blog
Learn how NAC Media offers a salt-free, eco-friendly solution to hard water problems.
The CQ Water Blog
From lead and chlorine to PFAS and bacteria, even “clean” water can carry hidden risks.
Collection of Articles
Water filtration solutions and benefits across home, commercial, and industrial use—covering health, safety, and uses.
Collection of Articles
Blogs covering various water filter cartridges—from sediment, to ceramic and specialty filters.
Collection of Articles
Learn how different water filtration technologies work—from reverse osmosis and ion exchange to carbon, UV, and more.
Collection of Articles
Explore articles on reverse osmosis, whole house, and point-of-use systems—plus maintenance guides, filter comparison...
Contaminants
Learn how to properly test your well water for contaminants. Discover testing methods, frequency, what to test for, a...
Contaminants
Think your water might be contaminated with PFAS? Learn about the signs to watch for and how to find out for sure.
Contaminants
PFAS are toxic “forever chemicals” found in tap water. Learn the risks and how to filter them out.
Contaminants
Learn about the main contaminants found in public drinking water and why they matter.
Contaminants
This comprehensive guide dives into the modern water quality crisis, detailing common pollutants, their health risks,...
Contaminants
Discover natural causes of hard water—plus quick fixes to stop scale, protect plumbing, and keep your home spot-free.
Contaminants
Not sure if you need a water softener? This guide shows four quick ways to test hardness at home and understand your ...
Contaminants
Wondering if you need a water softener? Here are 10 clear signs you have hard water.
Contaminants
Not sure if your problem is hard water or high TDS? Learn the difference and filtration solutions for each water qual...
Contaminants
TDS, how to test at home, ideal TDS ranges, and how filtration systems reduce TDS for safer, better-tasting water.
Contaminants
Discover exactly what hard water is, how it forms, why it hurts your plumbing, skin and wallet.
Contaminants
Arsenic is a hidden danger in many U.S. water supplies, especially private wells. Learn more here.
Contaminants
Tannins are a group of organic substances that naturally occur in various plants – including trees, shrubs, and herbs...
Contaminants
Learn how lead gets into drinking water, health risks, and the most effective filtration methods to protect yourself.
Contaminants
Learn what fluoride is, why it’s in tap water, potential health risks, and how to remove it effectively.
Maintenance
Ensure home-wide pure water with whole house RO maintenance. Learn weekly monitoring, pre-filter changes every 18 mon...
Maintenance
Maintain your under-sink or countertop RO system with ease. This guide covers 5-minute monthly checks, complete filte...
Maintenance
Think RO maintenance is complicated? Think again! This simple guide shows you how to maintain your reverse osmosis sy...
Maintenance
Keep your reverse osmosis system delivering pure water with this guide. Learn monthly checks, filter changes every 18...
Maintenance
Essential Steps for Tank Sanitization and Bacterial Prevention Regular cleaning of your re...
Maintenance
Learn how to restore your RO membrane's performance with our membrane cleaning guide.
Maintenance
Why Replacing Your RO Filters Matters Regular RO filter replacement is essential to protect your reverse osm...
Maintenance
Over time, RO membranes can clog or wear out. This guide shows you exactly how to remove and replace your reverse osm...
Maintenance
Extend the life of your Crystal Quest® softener with this step-by-step maintenance guide.
Maintenance
Learn how to properly maintain your salt-free water conditioner to keep it running efficiently.
Whole House
Learn how Point-of-Entry (POE) water filtration systems filter all water before it reaches your faucets and appliances.
Whole House
Live free from wondering what's in the water coming out of your home's faucets. Help protect your health, and your bu...
Reverse Osmosis
Installing a whole house reverse osmosis system can transform your home's water quality, but costs can vary widely - ...
Reverse Osmosis
Choosing the right reverse osmosis system can feel overwhelming with so many options on the market. This comprehensiv...
Reverse Osmosis
Complete guide to reverse osmosis water filtration: how it works, what it removes, and much more.
Filter Comparisons
Compares how Softeners and Conditioners work, cost, their economic impact, and maintenance.
Filter Comparisons
Confused between POU and POE water filtration? This guide explains what they are and how to choose the right system.
Ion Exchange
Technical overview of anion exchange resin: how it works, Type I vs II (SBA/WBA), silica/CO₂ performance, EBCT and re...
Ion Exchange
How DI works, when to use it, and how to reach ultra‑low TDS/resistivity with RO to DI.
Ion Exchange
Discover ion exchange for PFAS removal in water. Learn about resins, comparisons and uses.
Ion Exchange
Discover how ion exchange works and why it’s essential for removing contaminants like calcium, lead, and nitrates.
Media & Resin
Quick primer on anion exchange resin, how it swaps out anions like nitrate, sulfate, alkalinity, and silica.
Media & Resin
Discover how deionization (DI) resin works, why it’s essential for ultra-pure water, and why labs, aquariums, car was...
Media & Resin
Learn how activated carbon filters remove PFAS from drinking water.
Media & Resin
NAC and TAC media offer salt-free solutions to hard water problems—but how do they compare?
Media & Resin
Explore the science behind how NAC Salt-free Softening media works.
Cartridge Filters
A quick and easy read to understand how carbon filters remove PFAS from drinking water, and why they work.
Home Filtration Solutions
New to reverse osmosis? This beginner-friendly guide simplifies choosing your first RO system, covering essential ste...
Home Filtration Solutions
Discover 10 key benefits of home reverse osmosis systems in 2025: remove PFAS and contaminants for clean drinking wat...
Home Filtration Solutions
Worried about PFAS in your drinking water? Discover how to choose the right PFAS water filtration system for your home.
Home Filtration Solutions
Discover the top water filters that remove PFAS, including whole house and under-sink systems.
Home Filtration Solutions
Tired of scale stains? Learn quick DIY fixes, point-of-use filters, and full-home Crystal Quest® softeners that perma...
Home Filtration Solutions
Learn how Total Dissolved Solids (TDS) affect your well water quality and what you can do.
Home Filtration Solutions
Guide to choosing the best whole house water filter system—covering flow rate, filtration types, pH options, and pair...
Commercial Applications
Learn about the best water filtration systems for commercial cannabis cultivation.
Industrial Applications
Understand how wastewater treatment systems work, from primary filtration to advanced purification.
Health, Wellness & Home Benefits
Hard water isn’t just an annoyance - it costs money, irritates skin, and wastes energy.
Health, Wellness & Home Benefits
This guide explains ideal ppm levels, taste impacts, EPA limits, and Crystal Quest® fixes for every range.
Softeners & Conditioners
Looking for a healthier, salt-free alternative to traditional water softeners? Nanofiltration delivers softer water, ...
Softeners & Conditioners
Unsure if you really need a water softener? Read about these warning signs and discove systems to solve each one.
Softeners & Conditioners
Find out how salt-free water softeners work, what they do, and whether they're the right choice for your home.
Point of Use
Learn how POU systems work, what they remove, and which Crystal Quest filters are right for your space and lifestyle.
Membrane Filtration
Reverse osmosis (RO) is a powerful pressure-driven filtration technology that forces water through semi-permeable mem...
Membrane Filtration
Nanofiltration (NF) is a selective membrane filtration process that targets divalent ions, organic compounds, and con...
Membrane Filtration
An Introduction to Ultrafiltration Technology In the quest for clean, safe water, understanding the right filtrati...
Membrane Filtration
Microfiltration is a powerful, chemical-free way to remove sediment, bacteria, and turbidity while preserving water's...
Membrane Filtration
How nanofiltration removes PFAS, how it works, and where it fits in.
Membrane Filtration
Learn how reverse osmosis filtration works to remove up to 99% of PFAS from your water.
Membrane Filtration
Learn the differences between ultrafiltration, nanofiltration, and reverse osmosis.
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Explore in-depth topics on water filtration, treatment, and safety. Click a category below to dive into expert guides, comparisons, and insights tailored to your needs.
21 Articles
Read about whole-house, reverse osmosis, UV systems, and more—what to know, maintenance guides, and which is best for you.
How RO systems work, what they remove, buying guides, and benefits.
Ion exchange systems, salt-free conditioners, and hard water solutions.
Filter replacement schedules, troubleshooting, and optimization tips.
Point-of-entry systems for chlorine, sediment, and chemical removal.
Countertop, under-sink, pitcher, and faucet mount filter guides.
Compare RO vs carbon, whole house vs under-sink, and more.
15 Articles
Read about different contaminants such as microplastics, PFAs, lead, and more. Learn why they matter, and how to keep your water safe.
Learn how to properly test your well water for contaminants. Discover testing methods, frequency,...
Think your water might be contaminated with PFAS? Learn about the signs to watch for and how to f...
PFAS are toxic “forever chemicals” found in tap water. Learn the risks and how to filter them out.
Learn about the main contaminants found in public drinking water and why they matter.
This comprehensive guide dives into the modern water quality crisis, detailing common pollutants,...
Discover natural causes of hard water—plus quick fixes to stop scale, protect plumbing, and keep ...
16 Articles
Learn how reverse osmosis, ultrafiltration, ion exchange, and other methods purify and filter your water efficiently.
Membrane filtration systems including reverse osmosis, ultrafiltration, and nanofiltration technologies.
Ion exchange technology for removing contaminants, heavy metals, and dissolved minerals.
Water filtration media types including carbon filters, resin systems, and specialty media.
1 Articles
Read articles on carbon GAC, fluoride removal, Alkalizing filters and various medias—which filters to use and what they do.
Read our comprehensive articles about cartridge filters including carbon block, GAC, sediment, and specialty cartridges.
Explore our sediment filter articles covering spin-down filters, string-wound cartridges, pleated filters, and particle removal.
Access detailed comparison guides that analyze different water filter types, technologies, micron ratings, and effectiveness.
Browse articles about specialty filters designed for unique water challenges including fluoride removal, arsenic reduction, and iron filtration.
Discover our ceramic filter articles explaining how micro-porous ceramic technology removes bacteria, parasites, cysts, and sediment.
Browse our complete collection of filter type articles and guides
11 Articles
Learn how filtration works for homes, medical facilities, labs, and industries like fracking—plus the ideal system for your use case.
Explore our residential articles covering water filtration for home use applications including benefits, buyers guides, and how-to articles.
Read our commercial water treatment articles discussing filtration for hotels, office buildings, retail spaces, and bottling facilities.
Access our comprehensive industrial applications articles covering specialized systems for agriculture, chip manufacturing, and pharmaceuticals.
Browse wellness-focused articles about the health benefits of filtered water, alkaline water advantages, and hydration improvement.
Discover articles about ultra-pure water requirements for hospitals, clinics, laboratories, and dialysis centers.
Learn through our restaurant and cafe articles about water filtration for coffee shops, restaurants, breweries, and bars.
Stay informed with our newest insights on water filtration, safety, and treatment solutions
Pennsylvania is facing a growing water crisis. From PFAS “forever chemicals” to lead from aging p...
Read Article
2025 reverse osmosis pricing: countertop $100-$500; under‑sink $300-$1,000; whole‑house $5k-$12k....
Read Article
PFAS are turning up in tap water across the U.S. Learn what they are and why they're harmful.
Read Article
Learn how water softeners use ion exchange to remove hardness minerals to eliminate scale, dry sk...
Read Article
Learn how NAC Media offers a salt-free, eco-friendly solution to hard water problems.
Read Article
From lead and chlorine to PFAS and bacteria, even “clean” water can carry hidden risks.
Read ArticleLearn about water softening systems, maintenance guides, comparisons, and solutions for hard water problems throughout your home
Learn how water softeners use ion exchange to remove hardness minerals.
Read Article
Discover the telltale signs that indicate you need a water softener for your home to protect plumbing and improve water quality.
Read Article
Compare water softeners and conditioners to find the best solution for your home's water treatment needs and budget.
Read Article
Essential maintenance steps to keep your water softener running efficiently and extend its lifespan.
Read Article
Essential maintenance tips for keeping your salt-free water conditioner running optimally with proper filter and media care.
Read Article
Complete guide to whole house water filtration systems and their benefits for comprehensive water treatment.
Read ArticleLearn about dangerous water contaminants that may be lurking in your tap water. Discover their health effects, common sources, detection methods, and proven removal strategies to protect your family's health and safety
Learn about the main contaminants found in public drinking water and why they matter.
Read Article
Discover 5 natural causes of hard water plus quick Crystal Quest fixes to stop scale, protect plumbing, and improve water quality.
Read Article
Essential information about lead contamination in drinking water and effective removal methods to protect your family's health.
Read Article
Comprehensive guide to understanding arsenic contamination in water and effective removal strategies for safe drinking water.
Read Article
Everything you need to know about hard water, its effects on your home and health, and the best treatment solutions available.
Read Article
Learn about fluoride in drinking water, its health effects, and discover effective filtration methods for fluoride removal.
Read ArticleExplore the wide array of products Crystal Quest offers. Whatever system or use you might need, Crystal Quest has the perfect water solution for you.
Advanced multi-stage filtration with catalytic GAC, Eagle Redox Alloy®, and contaminant reduction technology.
9-13 GPM flow rate, perfect for 4-6 people. Removes chlorine, heavy metals, PFAS, and more.
Advanced filtration that both filters and alkalizes your water for improved taste and health benefits.
Affordable whole house solution that is effective and utilizes 3-stage filtration.
Ultimate purification removing up to 99% of all contaminants including PFAS, fluoride, and heavy metals.
💡 Pricing: Prices vary based on the specific RO configuration, storage tank additions, and optional enhancements such as remineralizing filters or UV water sterilization systems.
Perfect for smaller homes with less residents.
Mid-sized RO systems for average sized home use and residents, moderate to higher water consumption needs.
High capacity system for larger homes and increased residents with higher water demands and consumption needs.
⚠️ Note: The highest price reflects a fully equipped system and is not indicative of average pricing for typical requirements.
Compact, customizable, and affordable cartridge-based filtration solutions for whole house protection.
Single-stage SMART or specialized cartridge filtration for standard protection. 4-6 GPM flow rate.
Two-stage cartridge filtration that uses a SMART or specialty filter, followed by a carbon block for enhanced whole house protection.
Three-stage filtration that utilizes a sediment filter, SMART/specialty cartridge, and a carbon block filter for comprehensive protection.
Targeted solutions for specific water contaminants.
Crystal Quest Eagle Arsenic Oxide media effectively removes both As III & As V.
Calcium GAC or an aluminum oxide & calcium GAC media blend for effective fluoride reduction.
Uses Crystal Quest lead multimedia to target and remove lead, mercury, and other heavy metals.
Traditional softeners and salt-free conditioners for hard water treatment.
Ion-exchange technology removes calcium and magnesium for soft water.
Eaglesorb Anti-scale conditions water and prevents scale without requiring brine flushes or electricity.
Ultimate protection with filtration and traditional water softening.
Our water filtration experts are here to help answer any questions you may have, or help you find the perfect solution for your home's specific needs.
Monday - Friday | 9:00 AM - 5:00 PM EST
Resources
Expert answers to common water filtration questions - find the perfect system for your home
The best whole house water filter for well water depends on your specific contaminants, but generally includes:
For comprehensive protection, whole house reverse osmosis systems provide the ultimate solution for well water challenges. These systems remove up to 99% of all contaminants including bacteria, heavy metals, chemicals, and emerging contaminants like PFAS. Available in capacities from 300 to over 7,000 gallons per day, they can be equipped with:
Consider adding a water softener if you have hard water issues. Always test your well water first to identify specific contaminants and choose the appropriate filtration media.
Whole house water filtration system costs vary significantly based on the technology and features:
Additional costs include installation ($200-$500), annual filter replacements ($50-$300), and periodic maintenance. While the upfront investment may seem significant, a quality whole house system provides clean water for 10-15 years and costs far less than bottled water over time.
Whole house water filters and reverse osmosis systems serve different purposes and can work together. It's important to understand that "whole house" refers to the scope and capacity of treatment (all water entering your home), while "reverse osmosis" refers to the specific filtration mechanism:
Whole House Water Filters (Non-RO):
Whole House Reverse Osmosis Systems:
Point-of-Use RO: Under-sink or countertop systems that treat only drinking water
Best Approach: Many homeowners use a whole house filter for general protection plus a point-of-use RO system for drinking water, or invest in a whole house RO system for complete home protection.
Water filter replacement frequency depends on your filter type, water usage, and water quality:
Important Variables: Replacement frequency can vary drastically depending on feed water quality and water usage. Poor water quality or high usage may require more frequent changes, while excellent water quality may extend filter life.
Signs it's time to replace:
Pro Tip: More frequent replacements are fine and will keep your system working at optimal performance, but aren't always necessary if the filter still has remaining lifespan and capacity.
Whether you need a water softener with your whole house filter depends on your water hardness level:
Test Your Water Hardness:
Benefits of Adding a Water Softener:
Options:
Many whole house filters work better and last longer when paired with a water softener in hard water areas.
The most effective methods for PFAS removal from drinking water are:
Reverse Osmosis Systems:
Advanced Carbon Filtration:
SMART Filtration Media:
Ion Exchange Systems: Effective for certain PFAS compounds; Often combined with other technologies.
NOT Effective for PFAS: Standard carbon filters; Basic pitcher filters; Boiling water (actually concentrates PFAS); UV sterilization.
Given that PFAS are found in 97% of Americans' blood and linked to serious health issues, investing in proven PFAS removal technology is crucial for long-term health protection.
Big Blue water filter systems can be an excellent choice for many homes, especially if you want:
Cost-Effective Whole House Protection:
Customizable Filtration:
Good For: Moderate water quality issues; Homes with municipal water; Budget-conscious homeowners; Rental properties or temporary solutions.
Flow Rate: 4-6 GPM suitable for smaller homes (1-2 people).
Consider Upgrading If: You have severe water quality issues; Need higher flow rates (6+ people); Want longer-lasting filters; Require specialized contaminant removal.
Big Blue systems work best as: Entry-level whole house protection; Pre-filtration for other systems; Targeted treatment for specific issues.
They're worth it if your water quality needs are moderate and you want an affordable, flexible whole house solution.
Choose between salt-based and salt-free water treatment based on your specific needs:
Salt-Based Water Softeners ($1,295+):
Salt-Free Water Conditioners ($2,147+):
Choose Salt-Based If: You have very hard water (10+ GPG); You want true water softening; You don't mind maintenance and salt costs; Sodium content isn't a health concern.
Choose Salt-Free If: You want to keep beneficial minerals; Environmental impact is important; You prefer low-maintenance solutions; You have moderately hard water (4-8 GPG).
Many customers find salt-free conditioners provide excellent scale prevention while maintaining water quality for drinking.
Common tap water contaminants vary by location but typically include:
Chemical Contaminants:
Physical Contaminants:
Biological Contaminants:
Hardness Minerals: Calcium and magnesium causing scale buildup and soap issues.
The EPA regulates about 90 contaminants, but thousands of others remain unregulated. Testing your water is the only way to know what's actually present in your specific supply.
Bad-tasting or chlorine-smelling water is usually caused by:
Chlorine Odor and Taste:
Other Common Taste/Odor Issues:
Solutions:
If taste/odor changes suddenly, contact your water utility and consider testing, as it may indicate a contamination event or system problem.
Hard water contains high levels of dissolved minerals, primarily calcium and magnesium. It affects about 85% of American homes.
Water Hardness Levels:
Effects on Your Home:
Effects on You:
Hard water isn't harmful to drink and actually provides beneficial minerals, but the household effects make water treatment worthwhile for most families.
Determining if your water is safe to drink requires both understanding your water source and conducting appropriate testing:
For Municipal Water:
For Well Water:
Warning Signs to Test Immediately:
Testing Options: Professional lab testing provides the most comprehensive analysis. Home test kits are convenient for basic screening but may miss important contaminants.
Remember: Clear, good-tasting water can still contain dangerous invisible contaminants like lead, PFAS, or bacteria.
Whether water filters remove beneficial minerals depends on the filtration technology used:
Filters That Remove Minerals:
Filters That Preserve Minerals:
Solutions for Mineral Replacement:
Health Perspective:
For most families, the health benefits of removing contaminants far outweigh any concerns about mineral removal, especially when remineralization options are available.
Understanding the difference between filtration and purification helps you choose the right water treatment:
Water Filtration:
Water Purification:
Hybrid Approaches:
Choosing Between Them:
Most modern systems use elements of both filtration and purification to provide optimal water quality while maintaining beneficial characteristics.