Clearly Filtered
Clearly Filtered Pitcher
Pitcher filter independently tested to reduce PFOA + PFOS by >99% per NSF/ANSI P473 protocol.
$90
Water filtration
NSF P473-certified PFAS filters and the systems that earn the certification.
Most pitcher filters do not remove PFAS. Some do. We cover NSF/ANSI P473 (PFAS-specific) and NSF/ANSI 401 (emerging contaminants) certified systems across pitchers, countertops, under-sinks, and whole-house — and explain when reverse osmosis is worth the kitchen-counter footprint.
Top picks
See all water filtration →Frequently cited in NSF certification and material disclosures. Not personally tested.
AquaTru
AquaTru Countertop Reverse Osmosis
Countertop reverse osmosis with no plumbing. Tested to reduce 80+ contaminants including PFOA, PFOS, and PFNA.
$449
Berkey
Berkey Travel System
Gravity-fed stainless steel filtration. Long filter life. Tested for many contaminants including some PFAS.
$311
Epic Water Filters
Epic Pure Pitcher
Pitcher tested to reduce PFOA + PFOS along with chlorine, chloramine, lead, and pharmaceutical residues.
$70
Articles
explainer · 10 min read
How to Read Your Consumer Confidence Report (2026)
How to find your Consumer Confidence Report, decode the contaminant table, spot what is missing, and turn the results into a filter decision.
comparison · 11 min read
AquaTru vs Hydroviv — Countertop RO vs Custom Carbon
AquaTru countertop RO vs Hydroviv zip-code-custom under-sink carbon — cert paper trail, contaminant scope, install reality, and 5-year cost.
explainer · 7 min read
Catalytic Carbon: How It Works and Why It Matters for Chloramine
Standard pitcher carbon does not catch chloramine — the disinfectant more than 1 in 5 Americans drink. Catalytic carbon is the chemically modified version that does.
explainer · 10 min read
NSF/ANSI 58 Explained: The Reverse Osmosis Standard
NSF/ANSI 58 is the only standard written for reverse osmosis systems. What it tests, what the cert label means, and how to verify in the NSF database.
product-deep-dive · 11 min read
Aquasana AQ-5300+ Under-Sink Filter Review
Aquasana AQ-5300+ review — three-stage under-sink filter with catalytic carbon, NSF-tested for 78 contaminants including PFAS and lead. Pros and cons.
product-deep-dive · 10 min read
Clearly Filtered Pitcher Review
Clearly Filtered Pitcher review — 80oz Tritan pitcher tested to NSF/ANSI 42, 53, 401, and P473 for PFAS, lead, and fluoride. Pros, cons, and alternatives.
news · 4 min read
EPA UCMR 6: More PFAS Testing, Microplastics Left Off
EPA's July 2026 UCMR 6 proposal adds national PFAS monitoring (2028–2030) but leaves microplastics off the list. What will be tested — and what it means for your water.
explainer · 8 min read
How to Test Your Tap Water at Home: A Complete Guide for 2026
Three ways to test your tap water before buying a filter — your utility's free annual report, an at-home kit, or a state-certified lab.
explainer · 8 min read
NSF/ANSI 53 Explained: The Health-Effects Water Filter Certification
NSF/ANSI 53 is the health-effects standard for water filters — lead, cysts, VOCs, asbestos, mercury. Only the contaminants on the cert are covered.
product-deep-dive · 11 min read
Hydroviv Under-Sink Water Filter Review
Hydroviv under-sink review — zip-code-customized filter with IAPMO/NSF testing and a 720-gallon cartridge. Install reality, pros, cons, and alternatives.
explainer · 9 min read
Reverse Osmosis Membrane Chemistry Explained
How thin-film polyamide RO membranes reject PFAS, lead, fluoride, and microplastics — the chemistry of selective rejection and the real tradeoffs.
explainer · 10 min read
Nitrates in Drinking Water: Which Filters Actually Remove Them
Nitrate is the contaminant most likely to flag a rural well. RO and anion exchange remove it; carbon and pitcher filters do not. Boiling makes it worse.
explainer · 9 min read
Chromium-6 in Drinking Water: Which Filters Actually Remove It
No federal MCL exists for chromium-6. California sets 10 ppb. RO and anion-exchange media remove it; standard pitcher carbon does not.
news · 5 min read
EPA's $1B PFAS Strategy 2026: The Investment Side of the Rollback
EPA's May 2026 PFAS strategy adds $1B in drinking-water grants and enforcement updates alongside the rule rollback. What's funded, who qualifies, what it means.
explainer · 8 min read
Arsenic in Drinking Water: Which Filters Actually Remove It
An estimated 2 million Americans drink water above the EPA arsenic limit — almost all on private wells. RO and iron-oxide media remove it; standard carbon does not.
explainer · 10 min read
Mercury in Drinking Water: EPA Limits and Filter Options
Mercury in US tap water is rare, but well water near industrial sites can carry measurable levels. The EPA limit, health context, and which filters help.
product-deep-dive · 10 min read
Big Berkey Review: The Gravity Filter Everyone Argues About
A clear-eyed Big Berkey review for 2026 — the lab testing, the EPA stop-sale order, who it works for, and where AquaTru or Hydroviv beat it.
product-deep-dive · 7 min read
AquaTru Classic Countertop RO Review — No Plumber Needed
AquaTru Classic countertop reverse osmosis review — IAPMO-tested for 84 contaminants including PFAS, lead, fluoride, and microplastics. Pros, cons, and 5-year cost.
buying-guide · 6 min read
Best Countertop Water Filters (2026) — RO and Gravity
Countertop water filters with verifiable PFAS testing. Reverse osmosis, multi-stage carbon, and gravity systems compared.
cornerstone-guide · 7 min read
Best PFAS Water Filters in 2026
Four water filters with verifiable PFAS testing — pitcher, countertop RO, gravity, and budget. Vetted by NSF/ANSI P473 or independent lab results.
explainer · 6 min read
Chlorine vs Chloramine in Tap Water: Why Your Filter Choice Matters
More than one in five Americans now drinks water disinfected with chloramine, not free chlorine. Most pitcher filters do not reliably remove it. Here is why that matters.
news · 4 min read
EPA PFAS Rule Rollback 2026: What Changed and What Stays the Same
Two EPA rules from May 2026 scale back the 2024 PFAS drinking water rule. PFOA and PFOS limits stay at 4 ppt but compliance moved to 2031.
explainer · 5 min read
Fluoride in Tap Water: What the Science Says and How to Filter It
A neutral explainer on fluoride in US drinking water — the 2024 NTP monograph, the 2015 HHS recommendation, and which filter mechanisms actually remove it.
explainer · 6 min read
Lead in Tap Water: What the 2024 EPA Rule Changes for You
The 2024 EPA Lead and Copper Rule requires utilities to inventory every lead service line and replace them by 2037. What it means for your tap.
news · 8 min read
Microplastics in Drinking Water: What the 2026 EPA and HHS Moves Mean
The EPA proposed adding microplastics to the contaminant candidate list in 2026. Here is what is known about microplastics in tap and bottled water.
news · 5 min read
PFAS in Tap Water: Should You Be Worried?
The EPA finalized PFAS drinking water standards in April 2024. What the rule does, when utilities must comply, and when to filter sooner.
explainer · 6 min read
PFOA vs PFOS vs GenX — What Each PFAS Chemical Actually Is
PFOA, PFOS, GenX, PFNA — what each one is, what was banned, what replaced it, and what your filter has to handle.
comparison · 7 min read
Replacement Filter Cost — 5-Year Ownership for 10 Products
Sticker price lies. Here is the 5-year cost-per-gallon math for ten water filters, sourced from manufacturer-disclosed replacement cycles and current MSRPs.
comparison · 7 min read
RO vs Carbon vs Gravity Water Filters
A head-to-head of the three household water-filtration mechanisms — what each removes, what it costs over five years, and how to pick by priority.
explainer · 6 min read
What is NSF/ANSI P473? PFAS Filter Certification, Explained
The certification mark that actually means a water filter targets PFAS. What it tests, how to verify it, and why most pitchers do not have it.
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