Whole-house filtration research
Best whole house water filters of 2026
Nine of the best whole house water filters ranked by reduction claims, certified flow, pressure loss, replacement costs, warranty terms, and household fit.
Taylor Rupe·Founder & Editor
B.A. Psychology · B.S. Computer Science · Updated September 4, 2026
How we ranked the best whole house water filters for 2026
A whole-house water filter treats water at the point of entry before it reaches showers, appliances, and drinking taps. That broad scope makes service flow, pressure loss, maintenance, and the exact contaminant claim as important as the filter media. [1][5]
We compared exact systems rather than treating carbon tanks, cartridge housings, and specialty lead or PFAS filters as interchangeable. The first gate is a current utility report or laboratory result, followed by a model-level performance record that names the relevant reduction claim. [2][3][6]
Whole-house carbon can also remove a disinfectant residual from every fixture. CDC warns that taking chlorine or another disinfectant out at the point of entry may allow more microbial growth in premise plumbing, so broad treatment should have a defined reason and a maintenance plan. [1][7]
The best whole house water filters of 2026, ranked by reduction claims, flow, and ownership cost
Documentation review
September 4, 2026
These systems solve different water problems. The ranking rewards exact-model reduction evidence, realistic service flow, disclosed pressure loss, manageable upkeep, and clear terms; it does not imply that a PFAS filter is the right purchase for a home whose only documented issue is chlorine.
Rank 01 · Best documented whole-home PFAS system
A.O. Smith HomeShield AOS-HS-1200
The AOS-HS-1200 fits a home whose target appears among its five certified PFAS analytes; the exact record also supplies long certified capacity and pressure-loss data. Certification applies at 5.7 GPM, and feed water must stay inside the performance sheet's strict operating limits.
- Certified PFAS scope
- PFOA, PFOS, PFHpA, PFHxS, PFNA
- Certified flow
- 5.7 GPM at 4.9 psi drop
Rank 02 · Broadest certified PFAS analyte list
Culligan Aquasential Whole Home PFAS (Fiberglass Indoor)
Culligan's dealer-installed two-tank system fits a property needing its seven-analyte Total PFAS claim at no more than the certified 7.5 GPM. Its 158,000-gallon capacity is shorter than the higher-capacity PFAS options here, and the dealer must quote media service.
- Certified PFAS scope
- 7 named PFAS / NSF 53
- Certified flow
- 7.5 GPM at 7.5 psi drop
Rank 03 · Best certified lead and cyst cartridge
Pentair LR-BB50 (part 160410)
The LR-BB50 is the targeted pick when its exact NSF/ANSI 53 record for lead and cysts at 10 GPM matches the home's test and demand. Cartridge life is short, and Pentair's documents disagree between 35,000 and 40,000 gallons.
- Certified claims
- Lead and cyst / NSF 53
- Certified flow
- 10 GPM
Best whole house water filters #1 · Best documented whole-home PFAS system
A.O. Smith HomeShield AOS-HS-1200
View the A.O. Smith HomeShield Why it ranks #1 among the best whole house water filters: The AOS-HS-1200 fits a home whose target appears among its five certified PFAS analytes; the exact record also supplies long certified capacity and pressure-loss data. Certification applies at 5.7 GPM, and feed water must stay inside the performance sheet's strict operating limits.
Treated water with a confirmed PFOA, PFOS, PFHpA, PFHxS, or PFNA result, provided the household demand and feed-water chemistry fit the performance sheet.
Peak demand exceeds the certified 5.7 GPM, hardness or other feed-water values fall outside the listed limits, or replacement-tank and dealer pricing must be known before getting a quote.
The certified claim covers PFOA, PFOS, PFHpA, PFHxS, and PFNA at a 500,000-gallon capacity; the greater-than-99.9% figures are standard-condition test results, not a promise to remove every PFAS compound in every home. AOS-HS-1200 performance data sheet
Certification applies at 5.7 GPM with a 4.9 psi pressure drop. A.O. Smith separately publishes 11.2 GPM at 15 psi and warns that frequent higher-flow operation may reduce capacity. AOS-HS-1200 performance data sheet AOS-HS-1200 installation and owner manual
The stated feed-water limits include pH 7–8, hardness below 10 gpg, iron below 0.3 ppm, manganese below 0.05 ppm, turbidity below 1 NTU, TOC at or below 2 ppm, and no hydrogen sulfide or aluminum. AOS-HS-1200 performance data sheet
The official FAQ estimates about 4.5 years for four people and three years for six people from certified capacity, states a ten-year limited warranty, and says the exhausted tank is replaced; installed and replacement pricing is not published. HomeShield life, disposal, and warranty FAQ Current HomeShield AOS-HS-1200 catalog entry
- Certified PFAS scope
- PFOA, PFOS, PFHpA, PFHxS, PFNA
- Certified flow
- 5.7 GPM at 4.9 psi drop
- Higher published flow
- 11.2 GPM at 15 psi; not claim flow
- Capacity / upkeep
- 500,000 gal / replace media tank
View A.O. Smith HomeShield AOS-HS-1200 score breakdown
Watch: Chlorine and chloramine data are internally validated, not WQA-certified. The performance sheet names WQA and the exact model, but a durable model-specific WQA results URL was not available; recheck the live directory and obtain installed and replacement-tank prices before purchase.
Best whole house water filters #2 · Broadest certified PFAS analyte list
Culligan Aquasential Whole Home PFAS (Fiberglass Indoor)
View the Culligan PFAS filter Why it ranks #2 among the best whole house water filters: Culligan's dealer-installed two-tank system fits a property needing its seven-analyte Total PFAS claim at no more than the certified 7.5 GPM. Its 158,000-gallon capacity is shorter than the higher-capacity PFAS options here, and the dealer must quote media service.
City or appropriately pretreated well water with confirmed PFBS, PFDA, PFHpA, PFHxS, PFNA, PFOA, or PFOS and a preference for dealer monitoring and service.
You want DIY media changes, transparent national pricing, more than 7.5 GPM at claim conditions, or water outside the performance sheet's influent limits.
The Total PFAS claim names PFBS, PFDA, PFHpA, PFHxS, PFNA, PFOA, and PFOS and is rated for 158,000 gallons at 7.5 GPM with a 7.5 psi pressure drop. Whole Home PFAS owner guide and performance data
The design uses two 10-by-54-inch tanks containing 2.0 cubic feet of Calgon F600 granular activated carbon and 1.5 cubic feet of PFAS-selective anion resin. Whole Home PFAS owner guide and performance data
Culligan recommends a sediment prefilter of at least 50 microns, which is not included, and directs outdoor or irrigation demand around the treatment train; the dealer replaces media when the flow monitor reaches capacity. Whole Home PFAS owner guide and performance data Aquasential Whole Home PFAS product page
Coverage is one year for the complete filter and monitor, five years for specified head and electronic parts, ten years for the fiberglass tank, and lifetime for the optional Quadra-Hull tank; local pricing, freight, and service charges vary. Aquasential Whole Home PFAS product page Whole Home PFAS owner guide and performance data
- Certified PFAS scope
- 7 named PFAS / NSF 53
- Certified flow
- 7.5 GPM at 7.5 psi drop
- Certified capacity
- 158,000 gallons
- Service / price
- Dealer media change / quote only
View Culligan Aquasential Whole Home PFAS (Fiberglass Indoor) score breakdown
Watch: Culligan also documents Fiberglass Outdoor and Quadra-Hull Indoor/Outdoor configurations, but does not publish conventional consumer SKU numbers. Confirm the exact configuration, current WQA record, sediment prefilter, installed price, media price, and service charges on the dealer quote.
Best whole house water filters #3 · Best certified lead and cyst cartridge
Pentair LR-BB50 (part 160410)
View the Pentair LR-BB50 Why it ranks #3 among the best whole house water filters: The LR-BB50 is the targeted pick when its exact NSF/ANSI 53 record for lead and cysts at 10 GPM matches the home's test and demand. Cartridge life is short, and Pentair's documents disagree between 35,000 and 40,000 gallons.
Homes with a confirmed lead concern, sufficient inlet pressure, and peak demand within the certified 10 GPM rating.
PFAS, chloramine, hardness, iron, or untreated microbial contamination is the target, or changing an expensive 20-inch cartridge every four to five months is unacceptable.
The live NSF listing gives the LR-BB50 and LR-FB20BB a 40,000-gallon service cycle at 10 GPM for lead and cyst reduction. Pentair NSF/ANSI 53 certified-product listing
Pentair publishes a 0.5-micron carbon-block cartridge, 30–90 psi pressure range, 40–100°F temperature range, and an integrated flow restrictor and bypass. LR-BB50 installation and performance manual LR-BB50 2025 specification sheet
Certified test data report average reductions of 98.8% for lead at pH 6.5, 99.0% at pH 8.5, and 99.99% for cysts; these are test-condition results rather than a guarantee for an untested home. LR-BB50 installation and performance manual Pentair NSF/ANSI 53 certified-product listing
Pentair's 2025 sell sheet says four to five months or 35,000 gallons, while the NSF listing and other Pentair material say 40,000 gallons. Its category warranty page does not resolve an exact-model term, and current system, cartridge, and installation prices are not fixed nationally. LR-BB50 2025 specification sheet Pentair NSF/ANSI 53 certified-product listing LR-BB50 official product page Pentair point-of-entry warranty information
- Certified claims
- Lead and cyst / NSF 53
- Certified flow
- 10 GPM
- Service-cycle conflict
- 40,000 NSF / 35,000 Pentair sell sheet
- Published interval
- 4–5 months; price varies
View Pentair LR-BB50 (part 160410) score breakdown
Watch: Use the shorter 35,000-gallon replacement point unless Pentair reconciles its documents. A certified pressure-drop curve and unambiguous model-specific warranty were not located; confirm both, plus cartridge price, before sizing or purchase.
Best whole house water filters #4 · Best chlorine value
A.O. Smith AO-WH-FILTER
View the A.O. Smith AO-WH-FILTERWhy it ranks #4 among the best whole house water filters: The AO-WH-FILTER is the low-MSRP pick when a municipal-water home needs only its exact NSF/ANSI 42 free-chlorine claim. Its published life is six years with no drain or power; rated flow is 7 GPM and the claim does not extend beyond free chlorine.
Municipally treated water where the documented target is free-chlorine taste and odor and 7 GPM meets calculated simultaneous demand.
The water test calls for lead, PFAS, hardness, pathogens, iron, or a certified chloramine claim, or the household needs more than 7 GPM.
The current NSF listing and performance sheet support 600,000 gallons, 7 GPM, and free-chlorine taste-and-odor reduction; the official test table reports greater than 96.9% under its test conditions. AO-WH-FILTER NSF/ANSI 42 listing AO-WH-FILTER performance data sheet
The passive tank needs no electricity, drain, or backwashing and is replaced at the end of its rated life. A.O. Smith publishes a $349.99 MSRP and six-year limited warranty. AO-WH-FILTER product page and MSRP AO-WH-FILTER owner manual and warranty
The performance sheet specifies municipally treated water, a 20–100 psi range, and 40–90°F operation; it does not publish a pressure-drop figure. AO-WH-FILTER performance data sheet AO-WH-FILTER owner manual and warranty
The retail product page mentions chloramine and city-or-well use, but the exact NSF/PDS record supports free chlorine and municipal water. This ranking uses the narrower documented scope. AO-WH-FILTER product page and MSRP AO-WH-FILTER performance data sheet AO-WH-FILTER NSF/ANSI 42 listing
- Certified claims
- Free chlorine, taste and odor / NSF 42
- Certified flow
- 7 GPM; pressure drop not published
- Published life
- 600,000 gal / up to 6 years
- Published price
- $349.99 MSRP; street price varies
View A.O. Smith AO-WH-FILTER score breakdown
Watch: Do not repeat the product page's chloramine or broad well-water language as certified performance. A current pressure-drop curve and guaranteed street price are not published; size around the independently listed 7 GPM.
Best whole house water filters #5 · Best compact certified cartridge system
Aqua-Pure AP904 with AP917HD-S
View the Aqua-Pure AP904Why it ranks #5 among the best whole house water filters: The AP904 fits a space-constrained installation that needs its live exact-system NSF claims for chlorine and Class III particulate reduction. Its compact stainless head accepts a sanitary quick-change cartridge, but that proprietary cartridge is replaced about annually.
Space-constrained municipal-water installations targeting free chlorine, taste, odor, and Class III nominal particulate reduction at up to the certified 10 GPM.
Lead, PFAS, chloramine, hardness reduction, or more than 10 GPM at certified conditions is required, or proprietary replacement cost is a dealbreaker.
The exact AP904/AP917HD-S listing supports NSF/ANSI 42 free-chlorine, taste-and-odor, and nominal Class III particulate claims at 10 GPM. AP904 and AP917HD-S NSF listing
The system uses a one-inch NPT stainless-steel head and nominal 5-micron cartridge with a published service cycle of 100,000 gallons or up to 12 months. AP904 official specification sheet AP902, AP903, and AP904 installation manual
Scale-inhibition media in AP917HD-S is not certified hardness removal and does not make the AP904 a water softener. AP904 official specification sheet AP904 and AP917HD-S NSF listing
Solventum material has shown a 20 GPM statement alongside 37.8 L/min, which equals about 10 GPM. This ranking uses the NSF-listed 10 GPM; pressure drop and a fixed replacement price are not published in the reviewed sources. Aqua-Pure AP904 product page AP904 and AP917HD-S NSF listing AP904 official specification sheet
- Certified claims
- Chlorine + Class III particulate / NSF 42
- Certified flow
- 10 GPM
- Published service cycle
- 100,000 gal / up to 12 months
- Upkeep
- Proprietary cartridge; price varies
View Aqua-Pure AP904 with AP917HD-S score breakdown
Watch: NSF notes that the listed capacity does not apply to the mechanical particulate claim. The score uses 10 GPM, not conflicting 20 GPM copy, and does not award hardness-removal credit for scale-inhibition media.
Best whole house water filters #6 · Broad scope, highest routine cost
Aquasana OptimH2O EQ-OPTM / package EQ-OPTM-X
View the Aquasana OptimH2OWhy it ranks #6 among the best whole house water filters: OptimH2O belongs on a shortlist only when its exact lead, cyst, PFOA, and PFOS claims match the water result and its certified 4.82 GPM flow covers demand. The main cartridge costs roughly $600 and follows an annual replacement schedule.
Homes targeting lead, cyst, PFOA, and PFOS claims where measured peak demand fits 4.82 GPM and yearly proprietary cartridges fit the budget.
The household needs higher certified flow, wants a claim for PFAS beyond PFOA and PFOS, or will not spend roughly $600 per year on the main filter plus prefilters.
The certification language is limited to lead, cysts, PFOA, and PFOS. The current sheet reports 99.62–99.66% for the lead test conditions, 99.62% for cysts, and 98.2% for PFOA/PFOS; these results do not establish an all-PFAS claim. EQ-OPTM performance data sheet EQ-OPTM installation and owner manual
The performance sheet rates 106,750 gallons at 4.82 GPM. Aquasana separately publishes about 8.5 GPM as peak flow, which is not the certified claim flow. EQ-OPTM performance data sheet OptimH2O EQ-OPTM-X product page
The main EQ-OPTM-R cartridge is scheduled at 100,000 gallons or 12 months and lists for $599.99; the $41.99 prefilter is scheduled every six months. EQ-OPTM-R replacement and current price EQ-OPTM-PRE-R schedule and current price OptimH2O EQ-OPTM-X product page
Aquasana lists five years for the system housing and one year for the main cartridge. The reviewed IAPMO search did not yield a durable model-specific result URL, so the live record remains a pre-purchase recheck. OptimH2O EQ-OPTM-X product page IAPMO R&T certificate search EQ-OPTM installation and owner manual
- Certified scope
- Lead, cysts, PFOA and PFOS
- Certified flow
- 4.82 GPM; 8.5 GPM peak
- Certified capacity
- 106,750 gallons
- Upkeep
- $599.99 main yearly + prefilter
View Aquasana OptimH2O EQ-OPTM / package EQ-OPTM-X score breakdown
Watch: The live IAPMO record for EQ-OPTM was checked September 2, 2026 and should be rechecked before purchase. Do not treat the 8.5 GPM peak as certified performance, the internal chlorine/chloramine table as certification, or PFOA/PFOS as a claim for every PFAS compound.
Best whole house water filters #7 · Best dealer-managed chlorine system
Culligan Aquasential Smart HE 10-inch Cullar
View the Culligan Smart HE filterWhy it ranks #7 among the best whole house water filters: Culligan's Smart HE 10-inch Cullar suits a smaller-flow home that wants dealer-managed, backwashing carbon for chlorine at the certified 5.9 GPM rate. Its record publishes capacity and pressure loss and includes monitoring, but both purchase and service costs require a dealer quote.
Smaller-flow city-water households targeting certified free-chlorine taste and odor reduction and preferring dealer installation, monitoring, and media service.
Peak demand exceeds 5.9 GPM, transparent DIY costs matter, or lead, PFAS, hardness, or pathogen reduction is the actual target.
The 10-inch Cullar configuration is rated for 180,000 gallons and 5.9 GPM at a 5 psi pressure drop under its NSF/ANSI 42 chlorine claim. Smart HE owner guide and performance tables
The system uses a powered 24 VDC control to backwash and recondition its carbon bed; the dealer determines media replacement if reconditioning no longer restores acceptable taste or flow. Smart HE owner guide and performance tables Aquasential Smart HE filter product page
Operating limits are 20–125 psi and 33–120°F. Other Cullar tank sizes have different capacities and flow rates and should not be substituted for this exact table. Smart HE owner guide and performance tables
Coverage is one year for the complete conditioner, five years for the meter, and ten years for specified valve, circuit, and fiberglass-tank parts; dealer price, media cost, freight, labor, and service schedule are not public national figures. Smart HE owner guide and performance tables Aquasential Smart HE filter product page
- Certified claim
- Free chlorine, taste and odor / NSF 42
- Certified flow
- 5.9 GPM at 5 psi drop
- Certified capacity
- 180,000 gallons
- Service / price
- Backwashing, dealer-priced media
View Culligan Aquasential Smart HE 10-inch Cullar score breakdown
Watch: The product family contains multiple sizes and media configurations. Require the quote and tank label to say 10-inch Cullar, then verify that exact live WQA record and all installed, media, travel, and labor charges.
Best whole house water filters #8 · Longest tested chlorine life
Aquasana Rhino WH-1000 with WH-1000R
View the Aquasana Rhino WH-1000Why it ranks #8 among the best whole house water filters: The WH-1000 fits a free-chlorine job that stays within its independently tested 7 GPM rating; the same test runs to 1,000,000 gallons, supporting its long media-life claim. The reduction is not WQA certified, and rated pressure drop is 23 psi.
City-water homes focused on free chlorine with generous incoming pressure, demand within 7 GPM, and willingness to replace pre- and postfilters on schedule.
Pressure is marginal, simultaneous demand exceeds 7 GPM, or an exact certified lead, PFAS, chloramine, hardness, or pathogen claim is required.
The performance sheet reports a 1,000,000-gallon free-chlorine test at 7 GPM with greater than 97.4% overall reduction under laboratory conditions. WH-1000 performance data sheet
The same exact sheet reports a 23 psi pressure drop at the rated 7 GPM. Aquasana's 14.6 GPM peak figure is not the contaminant-test flow. WH-1000 performance data sheet Rhino WH-1000 product and replacement schedule
The tank is WQA certified to NSF/ANSI/CAN 61 for material safety and CSA B483.1 for material and structural requirements only; the complete system is not WQA certified for contaminant reduction. WH-1000 performance data sheet WH-1000 owner manual
The base configuration schedules a standard prefilter every two months and postfilter every six months. The product carries a ten-year limited warranty, while optional low-maintenance bundles change the upkeep and price. Rhino WH-1000 product and replacement schedule WH-1000 owner manual Aquasana whole-house warranty documents
- Evidence scope
- Independent chlorine test; not WQA reduction certified
- Rated flow
- 7 GPM at 23 psi drop
- Peak flow
- 14.6 GPM; not test flow
- Published life
- 1,000,000 gal / 10 years
View Aquasana Rhino WH-1000 with WH-1000R score breakdown
Watch: The 23 psi pressure drop is material and should be included in plumber sizing. Do not turn the tank's NSF/ANSI/CAN 61 material certification into contaminant certification or imply that the 14.6 GPM peak carries the tested chlorine result.
Best whole house water filters #9 · Best low-maintenance uncertified option
SpringWell CF1
View the SpringWell CF1Why it ranks #9 among the best whole house water filters: The CF1 fits city-water buyers who accept favorable but uncontrolled multi-year owner tests and want a passive, long-life media tank. Its published service flow is 9 GPM, but no exact finished-system certification or official pressure-drop curve was located.
City-water buyers prioritizing low routine maintenance and 9 GPM service flow who understand the difference between component certifications, uncontrolled field results, and exact-system certification.
A certified lead, PFAS, chloramine, or other health-effect claim is required, well water is untreated, or purchase depends on a published pressure curve and unambiguous six-versus-ten-year media terms.
SpringWell publishes 9 GPM service flow, a 25–80 psi operating range, a five-micron sediment postfilter changed every six to nine months, and media marketed for ten years or 1,000,000 gallons; no official pressure drop is stated. CF1 product specifications CF1 and CF4 installation instructions
The exact CF1 finished system was not matched to a certification record. Certified-component or tested-to language therefore receives much less credit than the exact-system records above. CF1 product specifications Affiliate-supported four-year field review Affiliate-supported installation and field review
Quality Water Lab reports four years of use and publishes before/after laboratory documents, but explicitly discloses affiliate links and calls the work a real-home comparison rather than a controlled test; it also confirms the whole system is not NSF certified. Affiliate-supported four-year field review
BOS Water also discloses affiliate links and reports field/lab experience. It identifies a six-year or 1,000,000-gallon performance/warranty basis while current product copy says ten years, leaving the commitment unresolved. Affiliate-supported installation and field review CF1 product specifications SpringWell limited warranty and guarantee terms
- Verification
- No exact finished-system certification located
- Published service flow
- 9 GPM; pressure drop unknown
- Published media life
- 10 years / 1,000,000 gal
- Routine upkeep
- 5-micron postfilter every 6–9 months
View SpringWell CF1 score breakdown
Watch: The two independent reviews are affiliate-supported and contextual only; their household samples cannot certify every manufacturer claim. Obtain written clarification of the six-versus-ten-year commitment and do not credit the CF1 with certified PFAS, lead, or chloramine reduction absent an exact live listing.
Scores use the Water Filter Report weights: contaminant fit 30, independent verification 25, ownership burden 20, household fit 15, and terms and support 10. This documentation review was updated September 2, 2026. Certified rated flow is kept separate from peak or maximum flow, NSF/ANSI 61 and 372 material requirements are not treated as contaminant-removal claims, and manufacturer or field testing is not relabeled as certification. Test the water and size peak demand before choosing a system. Prices, dealer quotes, certification-directory status, and replacement costs should be rechecked before purchase. Read the complete scoring method.
Which certifications prove whole-house filter claims?
This standard covers named aesthetic claims such as chlorine taste and odor. The listing must still match the exact model, replacement element, capacity, and rated flow. [4]
This standard covers specific health-effect claims such as lead or cyst reduction. A Standard 53 listing is not a blanket promise to reduce every contaminant within the standard. [4][3]
This standard covers reduction claims for a defined group of emerging compounds. It does not establish performance for every unregulated chemical or every model in a product family. [4]
What should you check before buying a whole-house filter?
Get the treatment scope, exact model, replacement parts, service flow, pressure loss, installation work, and maintenance schedule in writing. Penn State and Minnesota both advise matching equipment to a verified water problem and budgeting for installation and ongoing care. [6][5]
- What exact contaminant or aesthetic issue is the model independently certified to reduce?
- What is the rated service flow, and what pressure drop occurs at that flow?
- How much media is present, and what event ends its rated service life?
- What sediment prefiltration is required, and how often will it need replacement?
- What do replacement media, disposal, installation, and required service cost over ten years?
- Does the warranty cover media, valves, tanks, labor, or only selected components?
Use the ranking responsibly
Which whole-house water filter fits your test and flow?
Use the ranking as a documented shortlist, then confirm the water result, peak demand, incoming pressure, bypass layout, drain or power needs, and replacement supply. Test the treated water when the claim or local health guidance calls for verification, and record every service interval. [2][5][6]
Ask the installer to identify the exact performance sheet behind every promised reduction and to show the rated flow and pressure loss used in the sizing calculation. Put the prefilter, media or cartridge part numbers, capacity endpoint, bypass procedure, replacement labor, and disposal plan on the quote. If treatment removes disinfectant at the point of entry, discuss premise-plumbing maintenance and microbial implications before applying that choice to every tap. A high-ranked unit is still the wrong purchase when its certified claim, hydraulic limits, or upkeep plan does not match the house. [1][3][5][6]
Read our complete methodologySources / Documents reviewed
Whole-house filter standards and buying sources
Each number opens the source used for the nearby claim. We link to the issuing organization or original publication whenever it is available.
- 1 About Choosing Home Water Filters Centers for Disease Control and Prevention · Government
- 2 WaterSense Guide to Selecting Water Treatment Systems U.S. Environmental Protection Agency · Government
- 3 NSF Standards for Water Treatment Systems NSF · Certification body
- 4 NSF/ANSI 42, 53 and 401 Filtration Standards NSF · Certification body
- 5 Water Treatment Using Carbon Filters Minnesota Department of Health · Government
- 6 Tips for Buying Water Treatment Equipment Penn State Extension · Academic
- 7 Granular Activated Carbon (GAC) Fact Sheet Water Quality Association · Industry technical