# Frigidaire ULTRAWF PureSource Ultra Filter: Which Refrigerators Take It, How It Differs from WF3CB, EPTWFU01 and FPPWFU01, and Which Cross-Fits Are NSF Listed > Frigidaire ULTRAWF fits the PureSource Ultra push-twist housing. Cross-fits list NSF/ANSI 42 at 300 gal, 0.5 gpm. Not a WF3CB or EPTWFU01 fit. | | | |---|---| | Source | https://ownerspec.com/water/parts/frigidaire-ultrawf-puresource-ultra-refrigerator-filter/ | | Publisher | OwnerSpec (https://ownerspec.com/) | | Published | 2026-09-13 | | Updated | 2026-09-13 | | Facts verified | 2026-09-13 | | Disclosure | Contains affiliate links. OwnerSpec may earn a commission at no cost to the reader. | --- ## Short answer The Frigidaire ULTRAWF is the genuine PureSource Ultra cartridge: a round push-twist filter for the Frigidaire, Electrolux and Kenmore French-door and side-by-side refrigerators built with that housing. It does not interchange with the WF3CB (the older PureSource 3 twist-in) or the EPTWFU01 (the PurePour push-fit), so the number printed on the cartridge you remove decides the order. Frigidaire's own capacity, interval and certification figures for the ULTRAWF sit on product pages that did not respond this session, so this page prints none for the genuine part. The cross-fit cartridges built for the same housing are in the NSF DWTU database: the AQUA CREST AQF-ULTRAWF and Waterdrop WD-ULTRAWF are listed to NSF/ANSI 42 at 300 gallons and 0.5 gpm, and the RWF3300AH trade name adds NSF/ANSI 53 on the Aquazon Solutions and TOP PURE (USA) rows, though Tozone National's RWF3300AH row is NSF/ANSI 42 only. None of those three surfaced on Amazon this session; the GLACIER FRESH GF-ULTRAWF did, with a certification claim that is the seller's own. ## Fact sheet - **Answer:** The Frigidaire ULTRAWF is the genuine PureSource Ultra cartridge for Frigidaire, Electrolux and Kenmore refrigerators with the round push-twist housing, and it does not interchange with the WF3CB or EPTWFU01. Frigidaire's capacity and interval pages were unreachable, so this page prints none for the genuine part. Cross-fits built for the same housing are listed in the NSF DWTU database to NSF/ANSI 42 at 300 gallons and 0.5 gpm. - **Applies to:** ULTRAWF; Number printed on the old cartridge: ULTRAWF, WF3CB, EPTWFU01 or FPPWFU01 - **Compatibility basis:** NSF DWTU official listings for the cross-fit trade names AQF-ULTRAWF, WD-ULTRAWF, RWF3300A, WF3CB and EPTWFU01 (capacity, flow, standard and claims per row); Frigidaire's own ULTRAWF page did not respond this session - **Assumptions:** No NSF DWTU listing was found under the company names Frigidaire, Electrolux or Electrolux Home Products this session, so no genuine-part certification is confirmed here; any such claim is the maker's own.; Housing compatibility between the ULTRAWF and its cross-fits is inferred from the NSF trade-name pairing on each listing, not from a Frigidaire diagram.; The cross-fit capacity is a gallons figure only; none of the listings publishes a months interval. - **Method:** Capacity, flow, standard and reduction claims read row by row from the NSF DWTU listings for each cross-fit trade name; EPA figures read from the EPA regulations pages. Every figure is a published listing or regulation; nothing was tested. - **Primary source:** [NSF, DWTU official listing for trade name AQF-ULTRAWF (NSF/ANSI 42, 300 gallons at 0.5 gpm, chlorine and taste and odor reduction)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=AQF-ULTRAWF) (standards or certification body) - **Facts verified:** 2026-09-13 - **Last updated:** 2026-09-13 - **Canonical URL (cite this):** https://ownerspec.com/water/parts/frigidaire-ultrawf-puresource-ultra-refrigerator-filter/ Do not order yet: the ULTRAWF, WF3CB and EPTWFU01 are three different cartridges for three different housings, and the one that fits is written on the filter you are about to throw away. ## Which refrigerators take the ULTRAWF? The ULTRAWF fits the round push-twist PureSource Ultra housing used across Frigidaire, Electrolux and Kenmore (built by Frigidaire) French-door and side-by-side refrigerators. Frigidaire's compatibility list lives on frigidaire.com, which timed out on every attempt this session, so this page prints no model list and asks you to match the part number printed on the old cartridge instead. Frigidaire sells four current cartridge families, and they do not interchange. The housing column is inferred from the NSF trade-name pairings and the listing titles, not from a Frigidaire diagram. | Printed on the old cartridge | Family | Housing | Genuine part | |---|---|---|---| | ULTRAWF | PureSource Ultra | Round push-twist | Frigidaire ULTRAWF | | WF3CB | PureSource 3 | Round twist-in, older housing | Frigidaire WF3CB | | EPTWFU01 | PurePour | Inline push-fit | Frigidaire EPTWFU01 | | FPPWFU01 | PurePour PWF-1 | Not identified this session | Frigidaire FPPWFU01 | The genuine ULTRAWF carries no verifiable certification on this page. Searching the NSF DWTU database by company name for Frigidaire, Electrolux and Electrolux Home Products returned no matching products this session, so any NSF claim for the genuine part is listed per the maker's page and nothing more. ## What else fits the same housing? Every cross-fit below is in the NSF DWTU database under its own trade name, which is the only independent check available when the maker's page is down. All are rated 300 gallons at 0.5 gpm per their listing rows, and the standard is where they differ. | Alternative | Capacity and flow (NSF listing) | Standard (NSF listing) | What differs | |---|---|---|---| | AQUA CREST AQF-ULTRAWF (also -P, -D) | 300 gal at 0.5 gpm | NSF/ANSI 42 only | Chlorine and taste and odor claims; no NSF/ANSI 53. No Amazon listing found this session | | Waterdrop WD-ULTRAWF | 300 gal at 0.5 gpm | NSF/ANSI 42 only | Same element (EFF-6039S) and scope as the AQUA CREST part. No Amazon listing found | | RWF3300A / RWF3300AB (plain) | 300 gal at 0.5 gpm | NSF/ANSI 42 only | Listed under Aquazon Solutions, TOP PURE (USA), Tozone National and YUNDA H&H TECH, not under the Icepure name. No Amazon listing found | | RWF3300AH / RWF3300ABH (H suffix) | 300 gal at 0.5 gpm | 42 and 53 (Aquazon Solutions, TOP PURE (USA)); 42 only (Tozone National) | The H suffix adds a health-contaminant standard on two of the three makers' rows, not all; check the seller's own NSF row before relying on it. No Amazon listing found | | GLACIER FRESH GF-ULTRAWF | Not in the NSF database | Seller's claim only | The listing says to look up GF-ULTRAWF in the NSF database; that search returned no match this session | The WF3CB cross-fits sit in the same NSF database at the same 300 gallons and 0.5 gpm to NSF/ANSI 42, on a different element (EFF-6040S). The EPTWFU01 cross-fits from Qingdao Ecopure Filter Co. vary by suffix: the base part number is NSF/ANSI 42 only, the -P suffix adds NSF/ANSI 53, and the -D suffix reaches NSF/ANSI 42, 53 and 401, with lead, benzene and cyst claims the ULTRAWF-fit rows lack, at 200 gallons and 0.5 gpm. If your fridge is a GE or a Whirlpool, this is the wrong page: the [GE RPWFE](/water/parts/ge-rpwfe-refrigerator-filter/) and [Whirlpool EDR1RXD1](/water/parts/whirlpool-edr1rxd1-filter-1-refrigerator-filter/) pages carry those cartridges. ## How often does it need replacing? Frigidaire's interval for the genuine ULTRAWF is on the same unreachable product page, so this page carries no months figure for it. The cross-fit rows give a service cycle in gallons only: 300 gallons at 0.5 gpm on the NSF listings for the AQF-ULTRAWF, WD-ULTRAWF and RWF3300A families, and none of them publishes a months interval. A dispenser that also feeds an icemaker reaches 300 gallons sooner, and a slowing dispenser is the usual sign. Lead is a separate question: EPA's National Primary Drinking Water Regulations set the lead action level at 0.015 mg/L, revised to 0.010 mg/L from 1 November 2027, and only an NSF/ANSI 53 cartridge carries a lead claim at all. ## How do you check a certification claim? No Frigidaire or NSF counterfeit-identification page could be reached this session (frigidaire.com timed out; nsf.org returned HTTP 403), so this page cites no maker checklist. The check that needs none is the NSF DWTU search by trade name: a certified cartridge appears under the exact name printed on its box, and a claim not found there is the seller's word. **Which one to buy** The flaw first: this page cannot verify the genuine ULTRAWF's capacity or certification, and the three cross-fits it can verify in the NSF database did not surface on Amazon. If the old cartridge reads ULTRAWF and you want the maker's part, buy the Frigidaire ULTRAWF. If you want a cross-fit with an NSF row behind it, order the AQF-ULTRAWF, WD-ULTRAWF or RWF3300AH by trade name from another retailer. If a lead claim matters, check the seller's specific NSF DWTU row for the RWF3300AH first: only the Aquazon Solutions and TOP PURE (USA) listings carry NSF/ANSI 53, not the Tozone National one. The GLACIER FRESH GF-ULTRAWF is the only cross-fit found on Amazon; skip it if independent certification decides the purchase, since its trade name returned no NSF match. If the old cartridge reads WF3CB or EPTWFU01, buy the Frigidaire WF3CB or the Frigidaire EPTWFU01 instead. ## The picks - **Frigidaire ULTRAWF genuine**: Old cartridge reads ULTRAWF: the genuine PureSource Ultra part (1 count per the listing title; round push-twist PureSource Ultra cartridge; capacity and certification are Frigidaire's own claims, not confirmed here) Amazon: https://www.amazon.com/dp/B002JAKRAM/?tag=ownerspec-20 - **GLACIER FRESH GF-ULTRAWF, 2 pack**: ULTRAWF housing, the only cross-fit found on Amazon (2 pack per the listing title; certification is the seller's claim, and the trade name GF-ULTRAWF returned no NSF DWTU match this session) Amazon: https://www.amazon.com/dp/B0FT2GF88Q/?tag=ownerspec-20 - **Frigidaire WF3CB genuine**: Old cartridge reads WF3CB: the older PureSource 3 housing (1 count per the listing title; twist-in PureSource 3 cartridge; not an ULTRAWF fit) Amazon: https://www.amazon.com/dp/B0045LLC7K/?tag=ownerspec-20 - **Frigidaire EPTWFU01 genuine, set of 2**: Old cartridge reads EPTWFU01: the PurePour push-fit (Set of 2 per the listing title; inline push-fit PurePour cartridge; not an ULTRAWF fit) Amazon: https://www.amazon.com/dp/B0CXKH95V1/?tag=ownerspec-20 ## Frequently asked questions ### What does an NSF/ANSI 42 listing on a ULTRAWF-fit cartridge actually cover? NSF/ANSI 42 is the aesthetic-effects standard. The NSF DWTU listing rows for the AQF-ULTRAWF and WD-ULTRAWF carry two claims, chlorine reduction and taste and odor reduction, at a 300 gallon service cycle and 0.5 gpm. Lead, cysts and similar health-contaminant claims sit under NSF/ANSI 53, which neither of those rows lists. EPA sets no numeric drinking-water standard for chlorine taste. ### Is a cross-fit ULTRAWF cartridge rated for the same capacity as the genuine Frigidaire part? The cross-fits have a verifiable figure and the genuine part, on this page, does not. NSF's DWTU rows for the WD-ULTRAWF and AQF-ULTRAWF state 300 gallons at 0.5 gpm. Frigidaire's own ULTRAWF page timed out on every attempt this session, so its capacity, interval and flow rate are not printed here rather than copied from a reseller. ### What is the difference between the RWF3300A and the RWF3300AH? One letter, but the standard depends on the manufacturer's row. NSF's DWTU listing for the RWF3300A family shows the plain RWF3300A certified to NSF/ANSI 42 only. The RWF3300AH adds NSF/ANSI 53 on the Aquazon Solutions and TOP PURE (USA) rows, but Tozone National's RWF3300AH row lists NSF/ANSI 42 alone. All are rated 300 gallons at 0.5 gpm. Neither surfaced on Amazon this session. ### Does an EPTWFU01-fit cartridge reduce more than chlorine taste and odor? It depends on the suffix. NSF's DWTU rows for the EPTWFU01 family show the base part number certified to NSF/ANSI 42 only, the -P suffix adding NSF/ANSI 53, and the -D suffix reaching NSF/ANSI 42, 53 and 401, with claims up to lead, benzene and cysts, at 200 gallons and 0.5 gpm. That is a different push-fit cartridge, and it does not fit the ULTRAWF housing. ### What is the EPA action level for lead, and is it changing? EPA's National Primary Drinking Water Regulations set the lead action level at 0.015 mg/L today, and the same page states that from 1 November 2027 systems must comply with a revised action level of 0.010 mg/L. A cartridge with a lead claim must carry NSF/ANSI 53, and of the ULTRAWF cross-fits found this session only some RWF3300AH listings reach it, not the Tozone National one. ## Sources - [NSF, DWTU official listing for trade name AQF-ULTRAWF (NSF/ANSI 42, 300 gallons at 0.5 gpm, chlorine and taste and odor reduction)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=AQF-ULTRAWF) (standards or certification body) - [NSF, DWTU official listing for trade name WD-ULTRAWF (NSF/ANSI 42, 300 gallons at 0.5 gpm)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=WD-ULTRAWF) (standards or certification body) - [NSF, DWTU official listing for trade name RWF3300A (RWF3300A to NSF/ANSI 42; RWF3300AH to NSF/ANSI 42 and 53 from Aquazon Solutions and TOP PURE (USA), NSF/ANSI 42 only from Tozone National; 300 gallons at 0.5 gpm)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=RWF3300A) (standards or certification body) - [NSF, DWTU official listing for trade name WF3CB (cross-fit cartridges, NSF/ANSI 42, 300 gallons at 0.5 gpm)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=WF3CB) (standards or certification body) - [NSF, DWTU official listing for trade name EPTWFU01 (base part NSF/ANSI 42 only, -P suffix adds NSF/ANSI 53, -D suffix adds NSF/ANSI 401, 200 gallons at 0.5 gpm)](https://info.nsf.org/Certified/DWTU/Listings.asp?TradeName=EPTWFU01) (standards or certification body) - [NSF, Drinking Water Treatment Units official listings search](https://info.nsf.org/Certified/DWTU/) (standards or certification body) - [EPA, National Primary Drinking Water Regulations (lead action level 0.015 mg/L, revised to 0.010 mg/L from 1 November 2027)](https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations) (government or regulatory source) - [EPA, Secondary Drinking Water Standards: Guidance for Nuisance Chemicals](https://www.epa.gov/sdwa/secondary-drinking-water-standards-guidance-nuisance-chemicals) (government or regulatory source) --- Citation: OwnerSpec, "Frigidaire ULTRAWF PureSource Ultra Filter: Which Refrigerators Take It, How It Differs from WF3CB, EPTWFU01 and FPPWFU01, and Which Cross-Fits Are NSF Listed", https://ownerspec.com/water/parts/frigidaire-ultrawf-puresource-ultra-refrigerator-filter/, facts verified 13 September 2026. Canonical citation target: the URL above (the public HTML page), not this Markdown representation. Reuse: quoting with attribution and a link is permitted. See https://ownerspec.com/legal/terms/.