Water filter · faucet
PUR Plus Faucet Mount (PFM400H)
A faucet-mount system whose RF-9999 cartridge is genuinely NSF certified for lead, chlorine, mercury and microplastic reduction.
Bottom line
In our scoring the PUR Plus Faucet Mount (PFM400H) earns 6.4/10, a weak result, and it stands out on certification independence (10.0/10). On the data, it holds NSF certification to reduce lead, chlorine taste and odor, mercury. It works out to about $0.250 per gallon, expensive per gallon. Its weakest area in our scoring is total cost of ownership (3.5/10). Certification is not a substitute for a water test of your own supply.
Where to buy
No buy link on this one: it scored Limited under our rubric, and we only link products we would shortlist ourselves.
Total cost of ownership
Checked 45 days ago- Cost / gallon
- $0.250
- ~Annual filters
- $275/yr
Certifications
- NSF/ANSI 42chlorine
- NSF/ANSI 53lead, mercury, asbestos, benzene, pesticides
- NSF/ANSI 401microplastics
Filters only protect you on their swap schedule. Get an email reminder when this one is due - one note around swap time, nothing else.
Overview
The PUR Plus Faucet Mount (PFM400H) is a faucet water filter. It is third-party certified (NSF) to reduce lead, chlorine taste and odor, mercury, asbestos, benzene, microplastics, pesticides. Running cost works out to about $0.250 per gallon.
By the numbers
- Certified to reduce
- lead, chlorine taste and odor, mercury, asbestos, benzene, microplastics, pesticides
- Format
- faucet
- Cartridge life
- 100 gallons
- Cost per gallon
- $0.250
- Annual filter cost (~1,100 gal)
- $275/yr
- Flow rate
- 0.5 gpm
- Install
- faucet mount, tool-free
- Certifications
- NSF NSF/ANSI 42; NSF NSF/ANSI 53; NSF NSF/ANSI 401
Strengths
- + Certification Independence: 10.0/10
- + Capacity & Flow Fit: 8.0/10
Watch-outs
- - Total Cost of Ownership: 3.5/10
Who it is for
- · Homes with lead service lines or older plumbing (certified for lead)
Who should skip it
- · Heavy daily use - cost per gallon is high
What to know before buying
- · The PFM400H uses the RF-9999 filter cartridge, rated for up to 100 gallons or about 3 months, and the unit has a filter-change indicator light.
- · It is NSF-certified to reduce lead and mercury (NSF/ANSI 53) and chlorine (NSF/ANSI 42); microplastics and Standard 401 are marketing claims not in its specific NSF listing.
- · It threads onto a standard faucet without tools and has an on/off diverter; it does not fit pull-out or handheld sprayer faucets.
How it scored
Verified Contaminant Reduction
6.0/10 · 35%Held NSF/WQA/IAPMO certifications for the contaminants that matter. A claim is not a certification.
- +3NSF/ANSI 53 certified for lead ANSF/53 lead - Independently certified to reduce lead under NSF/ANSI 53.
- +1NSF/ANSI 42 certified for chlorine ANSF/42 chlorine - Certified to reduce chlorine taste and odor.
- +2NSF/ANSI 401 emerging contaminants ANSF/401 - Certified for emerging contaminants such as pharmaceuticals.
Total Cost of Ownership
3.5/10 · 25%Computed cost per gallon vs the format-class median. The number nobody surfaces.
- +2.5Cost per gallon vs class median A$0.250/gal (near class median) - Computed cost per gallon scored against the format-class median.
- +1No proprietary cartridge lock-in Bcross-compatible cartridges - Cartridges are sold separately with cross-compatible equivalents.
Certification Independence
10.0/10 · 15%Certified on the official database vs self-claimed 'tested to' marketing.
- +5Certifications verifiable on official database A3 listings - Certifications are listed on the official NSF/WQA/IAPMO database, not just a logo.
- +3Per-contaminant reduction disclosed Bperformance data sheet - Publishes percent reduction per contaminant at rated capacity.
- +2Marketing matches certified scope Aclaims within certified scope - Hero claims are within what the certifications actually cover.
Capacity & Flow Fit
8.0/10 · 15%Cartridge life and flow appropriate to the format.
- +3Cartridge life fits the format B100 gal (norm 100) - Rated cartridge life is appropriate for this filter format.
- +3Flow / storage disclosed and adequate B0.5 gpm - Flow rate or RO storage is disclosed and adequate for the format.
- +2Honestly rated filter life Bgallon rating matches typical use - Months claim matches the gallon rating at typical use.
Practical Fit
7.0/10 · 10%Install, footprint, and source-water readiness.
- +5Install type disclosed Cfaucet mount, tool-free - Install method and difficulty are disclosed up front.
- +2Predictable replacement schedule Chonest life rating - Replacement schedule is predictable from the honest gallon rating.
FAQ
- Is the PUR Plus Faucet Mount (PFM400H) NSF certified, and does it remove lead or PFAS?
- Per the public NSF/WQA/IAPMO databases it holds NSF certification to reduce lead, chlorine taste and odor, mercury, asbestos, and more. It is certified for lead.
- Which replacement filter does the PFM400H use and how long?
- It uses the RF-9999 cartridge, rated for up to 100 gallons or about 3 months, with an indicator light signaling when to change it.
- Does it require tools or plumbing?
- No. It threads directly onto most standard kitchen or bathroom faucets without tools, though it does not fit pull-out or sprayer-style faucets.
Compared head-to-head
Related guides
This score is our opinion under our published rubric, not a statement of objective fact or a lab test of this product. We score what third-party certifications prove; absence of a certification means we found no verification, not that a product fails to perform. Last reviewed 2026-06-06. Scored under water-v1.0. Prices were last checked 45 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.