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Omnipure Water Filters

Omnipure makes replacement cartridges, not complete systems. It holds 218 NSF listings, and its ELF 1MPF and Q5515 PF are rare small cartridges that are third-party certified for PFOA + PFOS under NSF/ANSI 53.

Best for

  • Custom under-sink builders choosing certified cartridges for a 1/4-inch quick-connect housing
  • Cooler and dispenser makers sourcing certified cartridges (ELF, K2, Q-series) for their own products
  • Anyone replacing the cartridge inside an Avalon, Vitapur, Glacier Bay, or similar water cooler
  • Tight-space installs that need certified PFOA/PFOS reduction in a small cartridge

Not recommended for

  • People buying a complete water-filtration system — Omnipure sells cartridges, not systems
  • Households needing reverse osmosis — Omnipure has no NSF/ANSI 58 listings
  • Buyers wanting easy retail availability — Omnipure sells mostly through OEM and specialty distributors
Mid tier — typically $200–$500
Jump to filters
  • Certs:NSF/ANSI 42, 53, 401
  • 164 SKUs
  • $100–$300
  • Parent:Marmon Water (a Berkshire Hathaway company)

Certification Reality: What's Actually Tested

This table shows the NSF/IAPMO/WQA-listed certifications for each Omnipure SKU we tracked, alongside the contaminants the brand markets but which do not appear on the third-party listing. Green chips are third-party verified; amber chips are marketing claims without a corresponding listing. Every row links to the live certifier database so you can verify the listed claim set yourself.

CARB10

Omnipure CARB10 (10-inch carbon-block cartridge)

Standards held

Performance

NSF/ANSI 42

What’s certified

  • Chlorine
  • Taste and odor

Brand claims but NOT certified

  • Lead
  • PFAS
  • Cysts

NSF listing

View NSF listing

ELF-1MPF

Omnipure ELF 1MPF (extended-life carbon-block, NSF/ANSI 53)

Standards held

Performance

NSF/ANSI 42
NSF/ANSI 53

What’s certified

  • Chlorine
  • Taste and odor
  • Cysts
  • PFOA
  • PFOS

Brand claims but NOT certified

  • Mercury
  • Asbestos
  • VOCs

The ELF 1MPF is one of only two Omnipure cartridges, alongside the Q5515 PF, third-party certified for PFOA + PFOS reduction under NSF/ANSI 53. That is rare for an in-line cartridge. Most filters with PFAS claims are full-size 10-inch-or-larger systems, so the ELF 1MPF is one of the few ways to get certified PFAS coverage in a tight space.

Read more

NSF listing

View NSF listing

Q5515-PF

Omnipure Q5515 PF (NSF/ANSI 53 lead + cyst + PFAS cartridge)

Standards held

Performance

NSF/ANSI 42
NSF/ANSI 53

What’s certified

  • Chlorine
  • Taste and odor
  • Lead
  • Cysts
  • PFOA
  • PFOS

Brand claims but NOT certified

  • Mercury
  • VOCs
  • Atrazine

NSF listing

View NSF listing

E5520

Omnipure E5520 (NSF/ANSI 401 microplastics cartridge)

Standards held

Performance

NSF/ANSI 42
NSF/ANSI 401

What’s certified

  • Chlorine
  • Taste and odor
  • Microplastics

Brand claims but NOT certified

  • BPA
  • Pharmaceutical surrogates
  • PFOA
  • PFOS

NSF listing

View NSF listing

CL10-Aquabond

Omnipure CL10 Aquabond (10-inch carbon-block with chloramine reduction)

Standards held

Performance

NSF/ANSI 42

What’s certified

  • Chlorine
  • Taste and odor

Brand claims but NOT certified

  • Lead
  • Cysts
  • Chloramine

NSF listing

View NSF listing

Check Certification for a Omnipure Filter

This widget shows the third-party-listed certifications for Omnipure SKUs only. Type a model number to filter the list below — every result links to the full breakdown. To search across every brand we track, use the global certification tool.

NSF/ANSI 42159 modelsNSF/ANSI 5349 modelsNSF/ANSI 40130 models

Listings as of Jun 4, 2026.

About Omnipure

Omnipure makes the cartridge inside other brands' filters — it doesn't sell complete systems. It's a Caldwell, Idaho maker of in-line plumbed-in cartridges (6 to 12 inches, 1/4-inch quick-connect or threaded fittings) that sit inside other-brand water dispensers, coolers, fridge filtration loops, espresso machines, and custom under-sink builds.

Genuinely certified, and broadly: 218 NSF listings (146 NSF/ANSI 42, 45 NSF/ANSI 53, 27 NSF/ANSI 401). The standout: the ELF 1MPF and Q5515 PF are among the few small cartridges with explicit NSF/ANSI 53 PFOA + PFOS claims — a go-to for brands wanting certified PFAS coverage in tight spaces.

Marmon Holdings (a Berkshire Hathaway subsidiary) acquired Omnipure in 2007.

Founded:1970
Headquarters:Caldwell, Idaho, USA
Parent company:Marmon Water (a Berkshire Hathaway company)

Ownership history

  1. 1970

    Founded as Omnipure Filter Co. in Caldwell, Idaho, making in-line plumbed-in replacement cartridges for other manufacturers and the aftermarket.

  2. 2007

    Acquired by Marmon Holdings, a Berkshire Hathaway conglomerate, and folded into Marmon's water-treatment division.

CARB / CL series (carbon block)

The workhorse OEM carbon-block line.

  • Certified: NSF/ANSI 42 (chlorine + taste & odor).
  • Variants: CARB6, CARB10, CL10 Aquabond.

K2 / K5 series (granular activated carbon)

Granular carbon cartridges, commonly OEM-supplied for water dispensers and coolers.

  • Certified: NSF/ANSI 42 (chlorine + taste & odor).

ELF series (broader NSF/ANSI 53)

Higher-grade carbon-block cartridges.

  • Certified: NSF/ANSI 53 — the ELF 1MPF is one of two Omnipure SKUs with explicit PFOA + PFOS reduction.

Q-series (NSF/ANSI 53 lead + cyst + PFAS)

The premium-feature line.

  • Certified: NSF/ANSI 53 — the Q5515 PF covers Lead + Cyst + PFOA + PFOS.

E-series (NSF/ANSI 401)

Emerging-contaminant cartridges.

  • Certified: NSF/ANSI 401 (microplastics).
  • Variants: E5520, E5620.

Made in-house in Caldwell, Idaho at 1904 Industrial Way, Caldwell, ID 83605 — the NSF address of record on all 218 listings.

Production is vertically integrated: carbon-block extrusion, GAC packing, housing assembly, and QA all happen in Idaho. Sub-components (carbon raw material, plastic housings) mix US and imported suppliers; Omnipure doesn't publish a per-SKU country-of-origin breakdown.

Omnipure Water Filter Collection (3)

Affiliate Disclosure: We earn affiliate commissions from purchases made through our links at no extra cost to you. This supports our testing and keeps our content free. Learn More

BEST HIGH TDS WATER
CL10RO T/33[2]

Omnipure Filter Co.

CL10RO T/33[2]

(419 reviews)
13.56

NSF Certified:

Performance

NSF/ANSI 42

Capacity

1500 gal

Filter Life

5 mo

Flow Rate

0.5 gpm

Removes 3 contaminants:

Chlorine (Free), Chlorine (Total), Chlorine Dioxide
View Details
BEST HIGH TDS WATER
K2586[4]

Omnipure Filter Co.

K2586[4]

(12 reviews)
18.67

NSF Certified:

Performance

NSF/ANSI 42

Capacity

1250 gal

Filter Life

4 mo

Flow Rate

0.5 gpm

Removes 3 contaminants:

Chlorine (Free), Chlorine (Total), Chlorine Dioxide
BEST HIGH TDS WATER
CL10RO T/28[2]

Omnipure Filter Co.

CL10RO T/28[2]

(4 reviews)
32.99

NSF Certified:

Performance

NSF/ANSI 42

Capacity

1500 gal

Filter Life

5 mo

Flow Rate

0.5 gpm

Removes 3 contaminants:

Chlorine (Free), Chlorine (Total), Chlorine Dioxide

Which Omnipure Filter Is Right for You?

We mapped each Omnipure SKU’s NSF-listed certifications against the 10 contaminants people search for most. Where Omnipure doesn’t have a certified SKU, we say so.

Lead
Best pick: Omnipure Q5515 PF (NSF/ANSI 53 lead + cyst + PFAS cartridge) — certified for Lead (Omnipure).
PFAS
Best pick: Omnipure Q5515 PF (NSF/ANSI 53 lead + cyst + PFAS cartridge) — certified for PFAS (Omnipure).
Fluoride
Not the right choice if Fluoride is your priority — no certified Omnipure SKU for Fluoride. Consider an NSF/ANSI 53-listed filter.
Arsenic
Not the right choice if Arsenic is your priority — no certified Omnipure SKU for Arsenic. Consider an NSF/ANSI 53-listed filter.
Nitrate
Not the right choice if Nitrate is your priority — no certified Omnipure SKU for Nitrate. Consider an NSF/ANSI 53-listed filter.
Chromium-6
Not the right choice if Chromium-6 is your priority — no certified Omnipure SKU for Chromium-6. Consider an NSF/ANSI 53-listed filter.
Mercury
Not the right choice if Mercury is your priority — no certified Omnipure SKU for Mercury. Consider an NSF/ANSI 53-listed filter.
Atrazine
Not the right choice if Atrazine is your priority — no certified Omnipure SKU for Atrazine. Consider an NSF/ANSI 53-listed filter.
Chloroform
Not the right choice if Chloroform is your priority — no certified Omnipure SKU for Chloroform. Consider an NSF/ANSI 53-listed filter.
Cysts
Best pick: Omnipure Q5515 PF (NSF/ANSI 53 lead + cyst + PFAS cartridge) — certified for Cysts (Omnipure).

How Omnipure Compares

Omnipure ELF 1MPF vs Aquasana AQ-5300 Replacement

Format

Omnipure ELF 1MPF

10-inch inline cartridge

Aquasana AQ-5300 Replacement

Proprietary under-sink replacement

MSRP (per cartridge)

Omnipure ELF 1MPF

~$45

Aquasana AQ-5300 Replacement

~$70

NSF/ANSI 42 (chlorine)

Omnipure ELF 1MPF

Yes

Aquasana AQ-5300 Replacement

Yes

NSF/ANSI 53 — PFOA + PFOS

Omnipure ELF 1MPF

Yes (certified)

Aquasana AQ-5300 Replacement

No (PFAS marketed, not certified)

NSF/ANSI 53 — Lead

Omnipure ELF 1MPF

No (lead is on the Q5515 PF)

Aquasana AQ-5300 Replacement

Yes

NSF/ANSI 53 — Cyst

Omnipure ELF 1MPF

Yes

Aquasana AQ-5300 Replacement

Yes

Best for

Omnipure ELF 1MPF

Custom builds and coolers that need certified PFAS

Aquasana AQ-5300 Replacement

Aquasana AQ-5300 owners — fits that system only

Bottom line: different products, different buyers. The ELF 1MPF (~$45) is an OEM cartridge with certified NSF/ANSI 53 PFOA + PFOS but no Lead claim; the Aquasana AQ-5300 replacement (~$70) is certified for Lead but not for PFAS, despite the brand's PFAS marketing.

  • Pick the ELF 1MPF if you want certified PFAS in a compact OEM or custom build (pair it or step up to the Q5515 PF for Lead too).
  • Pick the AQ-5300 if you own an Aquasana system and need its proprietary-fit cartridge.

Sources for facts in this comparison

  1. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    Omnipure ELF 1MPF NSF/ANSI 53 PFOA + PFOS listing · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  2. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    Aquasana / A.O. Smith NSF/ANSI 53 listed scope · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

Omnipure Q5515 PF vs Solventum Aqua-Pure 3MDW301

Format

Omnipure Q5515 PF

10-inch inline cartridge

Solventum Aqua-Pure 3MDW301

Residential under-sink system

MSRP

Omnipure Q5515 PF

~$50 (cartridge only)

Solventum Aqua-Pure 3MDW301

~$380 (system)

NSF/ANSI 53 — Lead + Cyst

Omnipure Q5515 PF

Yes

Solventum Aqua-Pure 3MDW301

Yes

NSF/ANSI 53 — PFOA + PFOS

Omnipure Q5515 PF

Yes (certified)

Solventum Aqua-Pure 3MDW301

No (covers NSF/ANSI 401 instead)

NSF/ANSI 401 (BPA, ibuprofen, microplastics)

Omnipure Q5515 PF

No

Solventum Aqua-Pure 3MDW301

Yes

Buyer fit

Omnipure Q5515 PF

Specialty and custom builds

Solventum Aqua-Pure 3MDW301

Consumer retail under-sink

Bottom line: a cartridge vs a full system. The Q5515 PF (~$50, cartridge only) carries explicit NSF/ANSI 53 PFOA + PFOS; the 3MDW301 (~$380, full system) has broader NSF/ANSI 401 emerging-contaminant scope but no NSF/ANSI 53 PFAS listing.

  • Pick the Q5515 PF if you want certified PFAS reduction for an OEM or custom install.
  • Pick the Aqua-Pure if you want a retail system with broad pharmaceutical-residue coverage.

Sources for facts in this comparison

  1. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    Q5515 PF NSF/ANSI 53 listed claim scope · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  2. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp

    Solventum 3MDW301 NSF certification scope · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

Looking for a broader comparison? See our full under-sink filter roundup.

Explore other brands: APEC Water Systems, AquaBliss, Aquaboon, AquaTru, iSpring, Kind Water Systems, Multipure, LifeStraw, Whirlpool, Solventum, SpringWell Water Filtration Systems, Pentair, Pelican Water, Crystal Quest, Hydroviv, Brondell, Bluevua, Berkey, ZeroWater, Aquasana, Express Water, Frizzlife, Epic Water Filters, Culligan, Clearly Filtered, Waterdrop, PUR, Doulton, Brita, and Propur.

What Reddit Says About Omnipure

These quotes are paraphrased — not verbatim — from public Reddit threads. Each card links to the original thread so you can read the discussion in context and verify the sentiment for yourself.

r/waterfiltersPositive
“Swapped the carbon cartridge in our water cooler for an Omnipure ELF 1MPF specifically because it's NSF/ANSI 53 certified for PFAS. Hard to find that certification on an inline cartridge this small.”
View thread
r/CoffeePositive
“Omnipure K2548 sits behind our 3-group espresso machine; flow rate held for 18 months before TDS started creeping. Cartridge changes are 5 minutes flat.”
View thread
r/HomeImprovementMixed
“My Avalon water cooler uses Omnipure K-series cartridges. Avalon charges $30 for branded replacements; the exact same Omnipure OEM part on omnipure.com is $14.”
View thread

Quotes verified on 2026-05-20.

Omnipure Customer Reviews Summary

5,000Total Reviews
4.5
Average

What Customers Love

  • Buying direct costs 2-3x less than the rebranded cartridges sold by cooler makers.
  • Flow and rated capacity are predictable, and the published specs hold up.
  • Certified PFAS reduction on the ELF and Q-series is rare in this size of cartridge.
  • Fits the large installed base of consumer water coolers and dispensers.

Common Concerns

  • No complete systems, so a full under-sink setup means sourcing the housing and fittings separately.
  • Matching the right cartridge means reading NSF listings and measuring fittings, which is hard for non-technical buyers.
  • Retail availability is narrower than rival brands, mostly specialty distributors and omnipure.com.
  • The documentation is aimed at integrators more than at DIY consumers.

Omnipure has a thin direct-to-consumer review base because it sells mostly through other manufacturers and specialty distributors rather than retail.

Most consumer reviews come from people replacing water-cooler cartridges (Avalon, Vitapur) who only realize the part is an Omnipure after the fact.

Reviewers in the specialty-build, espresso, and custom-RO crowd consistently call Omnipure a reliable cartridge brand with predictable flow and clear NSF listings.

Sources for Omnipure review data

  1. Amazon reviewaccessed: 2026-05-20
    https://www.amazon.com/dp/B00BA9DEN0?tag=waterfilte0f3-20

    Omnipure K-series Amazon review aggregate

  2. Brand officialaccessed: 2026-05-20
    https://omnipure.com/

    Omnipure publishes its catalog and cartridge specifications directly; reviews live in the OEM / specialty distributor channel

Review data aggregated from verified Amazon purchases. Individual results may vary.

About Omnipure Marketing Language

Some claims on Omnipure packaging and product pages are frequently confused with what the underlying third-party certifications actually cover. The note below documents one such mismatch with primary-source citations so you can verify the specifics yourself.

Omnipure makes cartridges, not complete systems — so the water cooler you bought is probably running an Omnipure cartridge inside.

Most people use Omnipure without knowing it. Avalon, Vitapur, Glacier Bay, Brio, and many other water-cooler and dispenser brands OEM-source Omnipure cartridges.

You're likely overpaying for the branded version. Avalon and Brio resell Omnipure cartridges (often K-series for bottom-load coolers) at 2-3x the cost. Match the part number and you can usually buy the identical NSF-listed Omnipure cartridge direct for less.

Omnipure also supplies cartridges to custom under-sink builds, specialty residential RO systems, and small ice/beverage equipment. Two SKUs — the ELF 1MPF and Q5515 PF — hold the rare NSF/ANSI 53 PFOA + PFOS listing that cooler brands almost never advertise, even when their cartridge has it.

Sources

  1. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp

    Omnipure's 218 NSF listings are cartridge-format products, not end-systems · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  2. NSF listingaccessed: 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    ELF 1MPF and Q5515 PF NSF/ANSI 53 listings include explicit PFOA + PFOS reduction · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  3. Brand officialaccessed: 2026-05-20
    https://omnipure.com/

    Omnipure supplies cartridges to consumer water-cooler / dispenser / under-sink OEMs

Verified 2026-05-20.

Frequently Asked Questions About Omnipure Water Filters

Yes — 218 NSF listings. Broken down: 146 NSF/ANSI 42 (chlorine, taste & odor, particulates), 45 NSF/ANSI 53 (lead, cysts, plus explicit PFOA + PFOS on the ELF 1MPF and Q5515 PF), and 27 NSF/ANSI 401 (microplastics). There are 0 NSF/ANSI 58 listings — Omnipure makes no reverse-osmosis systems.

For the live per-SKU list, search Omnipure on the NSF database. Before sourcing a cartridge, check your water quality by ZIP code so you target the right certified claim set.

Sources: [1]

How We Researched Omnipure

Our brand assessments follow a four-tier source ladder. We start with Tier 1 primary sources — NSF International, IAPMO, and WQA certification listings, plus SEC filings and EPA records — to establish what is third-party verified. We then layer in brand-official statements (corporate sites, datasheets, support pages) for context, tier-1 journalism for independent reporting, and community signals (Reddit threads, Amazon reviews) for real-world ownership experience. Every claim on this page traces back to one of the citations below.

Reviewed by TapWaterData Editorial.

Last full review: 2026-05-20 · Next scheduled review: 2027-05-20

All sources (7)

  1. NSF listingAccessed 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp

    All 218 Omnipure NSF listings across NSF/ANSI 42, 53, 401 · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  2. NSF listingAccessed 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    ELF 1MPF and Q5515 PF explicit PFOA + PFOS NSF/ANSI 53 reduction listings · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

  3. Brand officialAccessed 2026-05-20
    https://omnipure.com/

    Omnipure product catalog, cartridge form factors, fitting specifications, OEM/aftermarket positioning

  4. Brand officialAccessed 2026-05-20
    https://omnipure.com/about/

    1970 founding, Caldwell ID manufacturing, vertically-integrated production

  5. Brand officialAccessed 2026-05-20
    https://www.marmon.com/businesses/water

    Marmon Water subsidiary lists Omnipure among its water-treatment portfolio companies

  6. SEC filingAccessed 2026-05-20
    https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001067983&type=10-K

    Berkshire Hathaway 10-K describes Marmon Holdings ownership and water-treatment operations

  7. NSF listingAccessed 2026-05-23
    https://info.nsf.org/Certified/dwtu/Listings.asp?Standard=053

    Comparison facts: Aquasana AQ-5300 NSF/ANSI 53 listed scope · URL rewritten 2026-05-23: NSF Company= filter broken for our brand names; widened to non-Company-scoped variant per bug-fix plan

TapWaterData is independent and not affiliated with NSF International, IAPMO, or WQA.

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