# Generic vs OEM Refrigerator Water Filter: Is a Generic as Good, and How to Check the NSF Listing Instead of the Box > Neither OEM nor generic is certified by default. Look the model up at NSF, WQA or IAPMO: genuine EPTWFU01 is IAPMO-certified to 42, 53, 401; some generics 42 only. | | | |---|---| | Source | https://ownerspec.com/water/guides/refrigerator-water-filter-oem-vs-generic-nsf/ | | Publisher | OwnerSpec (https://ownerspec.com/) | | Published | 2026-10-04 | | Updated | 2026-10-04 | | Facts verified | 2026-10-04 | | Disclosure | Contains affiliate links. OwnerSpec may earn a commission at no cost to the reader. | --- ## Short answer A generic refrigerator water filter is as good as its listing row, and so is the OEM one. EPA's consumer tool for lead-reduction filters says to look for an accredited certifier's registered mark plus a statement of testing against NSF/ANSI 53, then confirm the model in that certifier's online directory: NSF, WQA, IAPMO, UL or CSA. The brand on the box decides nothing. Frigidaire's own EPTWFU01 performance data sheet reads "Certified by IAPMO R&T against NSF/ANSI Standard 42, Standard 53, Standard 401", so the genuine cartridge is not in NSF's database at all. NSF's database, searched for the trade name EPTWFU01, returns 10 aftermarket cartridges from one maker at 200 gallons: the plain suffix is listed to NSF/ANSI 42 only, the -P suffix adds 53 with a lead claim, and the -D suffix adds 401. Look up the exact model number, read the standard and the claims, and replace at the 6 months every maker prints. ## Fact sheet - **Answer:** A refrigerator filter is only as certified as its listing row. EPA's lead-filter tool says to look for an accredited certifier's mark plus a statement of testing against NSF/ANSI 53, then confirm the model in that certifier's directory. The worked example: a genuine Frigidaire EPTWFU01 is certified by IAPMO R&T to NSF/ANSI 42, 53 and 401, while 10 NSF-listed EPTWFU01 cross-fits split between 42 only and 42 plus 53 plus 401 by suffix. - **Basis:** EPA's Consumer Tool for Identifying POU Drinking Water Filters Certified to Reduce Lead (EPA/600/F-18/335), the NSF DWTU listing for trade name EPTWFU01, and Frigidaire's EPTWFU01 performance data sheet - **Assumptions:** NSF's own explainer on 'certified by NSF' versus 'certified to NSF standards' was read, but no NSF page defining the phrase 'tested to NSF standards' was reachable this session; that phrase is described here as a maker's own claim, as EPA's tool implies, not as an NSF definition.; The NSF DWTU rows quoted are the rows returned for trade name EPTWFU01 on 4 October 2026; the database is updated continuously and a model can be added or dropped.; The AHAM report tested counterfeit filters sold under copied OEM labels. It says nothing about third-party generic filters sold under their own brand, and this page does not use it as evidence about them.; No NSF/ANSI 58 definition is printed here because no NSF page on it was readable this session; 58 covers reverse osmosis systems, which refrigerator filters are not. - **Method:** Document comparison only. EPA's lead-filter tool, Health Canada's standard summary, NSF's certifier page, the NSF DWTU rows for EPTWFU01, Frigidaire's performance data sheet, the GE, Whirlpool and Samsung support pages, the AHAM report and the CBP release were each opened and quoted. No filter was tested. - **Primary source:** [EPA, A Consumer Tool for Identifying POU Drinking Water Filters Certified to Reduce Lead (EPA/600/F-18/335)](https://www.epa.gov/sites/default/files/2018-12/documents/consumer_tool_for_identifying_drinking_water_filters_certified_to_reduce_lead.pdf) (government or regulatory source) - **Facts verified:** 2026-10-04 - **Last updated:** 2026-10-04 - **Canonical URL (cite this):** https://ownerspec.com/water/guides/refrigerator-water-filter-oem-vs-generic-nsf/ If your question is whether a generic cartridge will physically fit, this is the wrong page: the [by-model guide](/water/guides/refrigerator-water-filter-by-model/) routes the code on your old cartridge to its parts page, and the cross-fit tables there carry the standard numbers. ## What does the box actually promise? EPA's tool is blunt about the status of the whole category: there is no mandatory federal requirement for point-of-use filters to be tested or certified under the Safe Drinking Water Act. A box can say anything. What it cannot fake is a row in a certifier's database, which is why every line below ends in a lookup. | Printed on the box | What it means | How to check it | |---|---|---| | NSF/ANSI 42 | Aesthetic effects: chlorine taste and odor, particulate (Class I), per Health Canada's summary. EPA's tool says to look for 42 Class I because some particulate can carry lead | The listing row shows the claims. "Chlorine Reduction, Taste and Odor Reduction" is a 42 row | | NSF/ANSI 53 | Health-related contaminants, Health Canada's list naming lead, mercury, cadmium, benzene and asbestos | EPA's tool: the certifier's mark, a statement of testing against NSF/ANSI 53 and a lead claim, then the directory row with "Lead Reduction" in it | | NSF/ANSI 401 | Emerging compounds and incidental contaminants, Health Canada naming BPA, estrone, ibuprofen, naproxen and nonyl phenol | A separate 401 row; the EPTWFU01 -D variants carry phenytoin, ibuprofen, naproxen, estrone, bisphenol A and nonylphenol | | NSF/ANSI 58 | Reverse osmosis systems. A refrigerator cartridge is not one; the number does not belong on its box | No NSF page on 58 was readable this session, so see the [standards explainer](/water/guides/nsf-ansi-water-filter-standards-explained/) | | "Certified by NSF" | NSF's own page: tested in NSF laboratories, authorised to carry the NSF mark | info.nsf.org/Certified/DWTU, manufacturer plus model | | "Certified to NSF/ANSI standards by [IAPMO R&T, WQA, UL, CSA]" | NSF's page: certified to the standard by another certification body, no NSF mark | That certifier's directory: IAPMO pld.iapmo.org, WQA find-products, UL database.ul.com, CSA product listing, all named in EPA's tool | | "Tested to NSF standards" or "meets NSF standards" | Names no certifier, so there is no directory to open. It is the seller's own claim | Search all the directories above; a model in none of them is unverified | EPA's tool gives the packaging wording to look for: "Tested and Certified by (name of certification body) against NSF/ANSI Standards 42 and 53 for the claims specified on the Performance Data Sheet." If lead is not in that sentence, EPA says to check the table on the box, the performance data sheet, or the certifier's directory. A performance data sheet is the maker's per-model document listing each substance, the challenge concentration and the reduction achieved. Frigidaire's for the EPTWFU01 prints lead at pH 6.5 reduced by 99.6 and 99.3% from 150 µg/L, with the IAPMO test report number beside it. ## Why does OEM versus generic miss the point? Because the certifier does not care who made it. The same Qingdao Ecopure cartridge, NSF model EFF-6047S, sits in NSF's directory under the brands AQUA CREST, Maxblue, Waterdrop and "Fridge filters", and the rows differ by suffix, not by brand. | EPTWFU01 fit, 4 October 2026 | Certifier and standards | Lead claim | |---|---|---| | Frigidaire EPTWFU01, genuine, 125 gallons at 0.65 gpm | IAPMO R&T: NSF/ANSI 42, 53, 401 and CSA B483.1, per Frigidaire's data sheet | Yes, on the data sheet | | AQF-EPTWFU01, MB-EPTWFU01, WD-EPTWFU01, EPTWFU01-2, 200 gallons at 0.5 gpm | NSF: NSF/ANSI 42 only | No | | AQF-EPTWFU01-P, MB-EPTWFU01-P, WDS-EPTWFU01, 200 gallons | NSF: NSF/ANSI 42 and 53 (cyst, lead, benzene, carbofuran, endrin) | Yes | | AQF-EPTWFU01-D, MB-EPTWFU01-D, WDP-EPTWFU01, 200 gallons | NSF: NSF/ANSI 42, 53 (adds mercury) and 401 | Yes | Two things follow. The genuine part is certified, but not by NSF, so a reader who searches NSF for Frigidaire and finds nothing has learned nothing. And a generic from the first row carries a real NSF mark and no lead claim, while its sibling one suffix along carries three standards. The brand is the same on both boxes. NSF's claims guide separates "Refrigerator Filters, Integrated" from "Refrigerator Filter, Aftermarket" in its lead-reduction lists, so pick the right product type when you search, or the row will not appear. The genuine EPTWFU01 has its own page at [Frigidaire EPTWFU01](/water/parts/frigidaire-eptwfu01-puresource-ultra-ii-refrigerator-filter/). The [ULTRAWF](/water/parts/frigidaire-ultrawf-puresource-ultra-refrigerator-filter/), [GE RPWFE](/water/parts/ge-rpwfe-refrigerator-filter/), [everydrop Filter 1](/water/parts/whirlpool-edr1rxd1-filter-1-refrigerator-filter/), [LG LT1000P](/water/parts/lg-lt1000p-refrigerator-filter/) and [Samsung DA29-00020B](/water/parts/samsung-da29-00020b-refrigerator-filter/) pages run the same comparison for their housings. ## Where does the counterfeit warning fit? Not here, mostly. A counterfeit copies an OEM brand, part number and certification marks; a generic sells under its own name. The makers' warnings are about the first group. GE Appliances' support page says counterfeits use misleading and fraudulent labels that violate trademarks and "falsely claim to meet NSF/ANSI Drinking Water Treatment standards". AHAM's 2018 report tested 32 counterfeit filters supplied by LG, Electrolux, Samsung, Whirlpool, GE Appliances and Sub-Zero for lead reduction out to 200% of rated capacity, the NSF/ANSI 53 test length, and reports that 100% failed to meet the standard. CBP's 2019 release reports 5,202 filters seized at LA/Long Beach infringing Brita, GE, Frigidaire, PUR and NSF certification trademarks; the same release counts 169,490 counterfeit water filters of all kinds (refrigerator, under-sink, pool and spa) seized at that port since October 2018. None of that was a test of generics, and this page does not read it as one. It is the reason to buy a genuine cartridge from the maker or a retailer the maker names, and to open the listing for a generic rather than trusting the mark printed on it. Frigidaire's own page warns that another seller's product might look like the genuine one and still be counterfeit. **Before you buy either one** Do not buy on the box. Open the certifier's directory for the exact model number with its suffix, and read the standard and the claims on that row. If the lookup takes longer than you have, the two genuine cartridges with a certifier and standard numbers on an opened maker document are the Frigidaire EPTWFU01 (IAPMO R&T, 42, 53, 401, per its data sheet) and the everydrop EDR1RXD1 (42, 53, 401 per Whirlpool's page, with EDR1RXD1B on NSF's lead list). No generic is linked here because no generic ASIN was matched to an NSF row this session. ## When do you replace it, whichever you buy? Every maker prints 6 months, and a gallon figure that can arrive first. | Maker | Interval as printed | |---|---| | GE Appliances | Every six months or usually after every 170 to 200 gallons, depending on the model; sooner if flow to the icemaker or dispenser drops | | Whirlpool (everydrop) | Every 6 months, when the indicator light comes on, or as needed; sooner if flow drops | | Samsung | Every six months; the same page says to avoid third-party filters because they may cause leaks | | Frigidaire EPTWFU01 | Data sheet: every 6 months or sooner, 125 gallon capacity; product page table: 3 months for 5 or more people, 4 months for 4, 6 months for 3 | Frigidaire's table assumes 0.5 gallons per person per day and 60% of it through the filter, which is a usable rule for any brand that prints only "6 months". ## What should you do first? 1. Read the full model number off the cartridge you are replacing, including any suffix letter. 2. Search it in NSF's DWTU directory with the product type set to aftermarket or integrated refrigerator filter; if nothing returns, try IAPMO's and WQA's directories, since the genuine part may be certified there. 3. Read the row: the standard numbers and the claims list. A 42-only row has no lead claim; a 53 row with "Lead Reduction" does. 4. Buy a genuine cartridge only from the maker or a retailer it names, and keep the box: EPA says the marks sit on the filter or its smallest package. 5. Set a 6-month reminder, and shorten it to Frigidaire's 3 or 4 months if the household is 4 or more. ## Frequently asked questions ### Is a generic refrigerator water filter as good as the OEM one? Only its listing row can answer that. NSF's directory for the EPTWFU01 fit shows the same aftermarket maker selling a 42-only cartridge and a 42, 53 and 401 cartridge one suffix apart, while Frigidaire's own EPTWFU01 is certified by IAPMO R&T, not NSF, to 42, 53 and 401. Compare the standard numbers and the claims for the exact model, not the brand on the box. ### What is the difference between 'certified to NSF/ANSI 53' and 'tested to NSF standards'? EPA's lead-filter tool says certification bodies require their registered mark on the product together with a statement of testing against NSF/ANSI 53 and a lead claim, and that the model should then appear in the certifier's online directory. A box that says only 'tested to NSF standards' names no certifier and no directory entry, so it is the seller's own claim until you find the row. ### Does a genuine OEM filter always show up in the NSF database? No. NSF's own page says a product can be certified to an NSF/ANSI standard by another certification body, and only NSF-certified products carry the NSF mark. Frigidaire's EPTWFU01 performance data sheet reads 'Certified by IAPMO R&T against NSF/ANSI Standard 42, Standard 53, Standard 401, and CSA B483.1', so its record lives at IAPMO, and an NSF search for Frigidaire returns nothing. ### How do I tell a counterfeit OEM filter from a generic one? A counterfeit copies the OEM brand, part number and certification marks; a generic sells under its own brand and part number. AHAM's 2018 report tested 32 counterfeit filters supplied by LG, Electrolux, Samsung, Whirlpool, GE Appliances and Sub-Zero and found 100% failed the NSF/ANSI 53 lead requirement. In 2019 CBP seized 5,202 counterfeit refrigerator filters infringing Brita, GE, Frigidaire, PUR and NSF trademarks. ### How often should a refrigerator water filter be replaced? Every 6 months is what GE, Whirlpool, Samsung and Frigidaire each print, with a gallon cap on top: GE says 170 to 200 gallons depending on model, Frigidaire's EPTWFU01 sheet rates 125 gallons, and the NSF-listed EPTWFU01 cross-fits carry a 200 gallon service cycle. Frigidaire's own table shortens that to 4 months for a family of 4 and 3 months for 5 or more. ## Sources - [EPA, A Consumer Tool for Identifying POU Drinking Water Filters Certified to Reduce Lead (EPA/600/F-18/335): accredited certifiers, marks, NSF/ANSI 53 statement, 42 Class I, performance data sheet, certifier directories, no federal mandate](https://www.epa.gov/sites/default/files/2018-12/documents/consumer_tool_for_identifying_drinking_water_filters_certified_to_reduce_lead.pdf) (government or regulatory source) - [Health Canada, Finding a drinking water filter (NSF/ANSI 42 aesthetic, 53 health-related contaminants, 401 emerging compounds; seven recognized certifiers)](https://www.canada.ca/en/health-canada/services/publications/healthy-living/infographic-finding-drinking-water-filter.html) (manufacturer or vendor document) - [NSF, Are You Certified by NSF or to NSF? (certified by NSF carries the NSF mark; certified to an NSF/ANSI standard by another certification body does not)](https://www.nsf.org/knowledge-library/are-you-certified-by-nsf-or-to-nsf) (standards or certification body) - [NSF, Contaminant Reduction Claims guide (separate lead-reduction listings for integrated and aftermarket refrigerator filters)](https://www.nsf.org/consumer-resources/articles/contaminant-reduction-claims-guide) (standards or certification body) - [NSF, Certified Drinking Water Treatment Units search form](https://info.nsf.org/Certified/DWTU/) (standards or certification body) - [NSF, DWTU official listings for trade name EPTWFU01 (Qingdao Ecopure model EFF-6047S, 200 gallons at 0.5 gpm; 42-only, 42 plus 53, and 42 plus 53 plus 401 variants by suffix)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=EPTWFU01) (standards or certification body) - [Frigidaire, Performance Data Sheet, PureSource Ultra II using replacement cartridge EPTWFU01 (P/N A02536409): certified by IAPMO R&T against NSF/ANSI 42, 53, 401 and CSA B483.1; 125 gallons; 0.65 gpm; replace every 6 months or sooner](https://frigidaire.bynder.com/m/3fac07f7a05a8d78/original/A02536409-pdf.pdf) (manufacturer or vendor document) - [Frigidaire, EPTWFU01 PureSource Ultra II product page (replace every 6 months; 3 months for 5 or more people, 4 months for 4; 125 gallon rated capacity; counterfeit warning)](https://www.frigidaire.com/en/p/accessories/refrigerator-accessories/refrigerator-accessories-and-consumables/water-filters/EPTWFU01) (manufacturer or vendor document) - [WQRF, Product Certification Resources (NSF, WQA Gold Seal, IAPMO R&T, CSA Group, UL and ICC-ES as certifiers)](https://www.wqrf.org/product-certification-resources.html) (manufacturer or vendor document) - [GE Appliances, Refrigerator: Genuine Water Filter vs Counterfeit Filter (counterfeits use fraudulent labels and falsely claim to meet NSF/ANSI standards)](https://products.geappliances.com/appliance/gea-support-search-content?contentId=37313) (manufacturer or vendor document) - [AHAM, Fake Filters, Real Problems (32 counterfeit filters, 100% failed the NSF/ANSI 53 lead requirement; 100% of capacity equals 6 months)](http://filteritout.org/wp-content/uploads/2018/05/FilteritOut_Report.pdf) (manufacturer or vendor document) - [AHAM, Counterfeit Filters (counterfeits made nearly indistinguishable from legitimate models)](https://www.aham.org/AHAM/Safety/Counterfeit-Filters.aspx) (manufacturer or vendor document) - [U.S. Customs and Border Protection, Over 5,200 Fake Refrigerator Water Filters from China Seized at LA/Long Beach (30 September 2019; 5,202 filters infringing Brita, GE, Frigidaire, PUR and NSF trademarks; 169,490 counterfeit water filters of all kinds seized at the port since 1 October 2018)](https://www.cbp.gov/newsroom/local-media-release/over-5200-fake-refrigerator-water-filters-china-seized-cbp-lalong-beach) (government or regulatory source) - [GE Appliances, Refrigerator: Replacing the Water Filter (every six months or 170 to 200 gallons, depending on model)](https://products.geappliances.com/appliance/gea-support-search-content?contentId=21284) (manufacturer or vendor document) - [Whirlpool Product Help, When to Change the Water Filter (every 6 months, when the indicator light comes on, or as needed)](https://producthelp.whirlpool.com/Refrigeration/Water_Filter_Information/Installation_Support/When_to_Change_the_Water_Filter) (manufacturer or vendor document) - [Samsung US Support, How to replace the water filter in a Samsung refrigerator (every six months; avoid third-party filters)](https://www.samsung.com/us/support/answer/ANS10005090/) (manufacturer or vendor document) --- Citation: OwnerSpec, "Generic vs OEM Refrigerator Water Filter: Is a Generic as Good, and How to Check the NSF Listing Instead of the Box", https://ownerspec.com/water/guides/refrigerator-water-filter-oem-vs-generic-nsf/, facts verified 4 October 2026. 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