EPTWFU01
Frigidaire PureSource Ultra II water filter
Oohunt Deal Desk · Last checked 2026-11-02
The PureSource Ultra II, and the newer of Frigidaire's two in-compartment water cartridges. The II is not decoration: this is a separate part from the ULTRAWF, with its own install guide.
Which Frigidaire filter is yours
These are not interchangeable. Match the number on the cartridge you are replacing.
| Specification | ULTRAWF | EPTWFU01this page | WF3CB | PAULTRA2 |
|---|---|---|---|---|
| Fits | Frigidaire French Door, Side by Side and Top Freezer refrigerators (all 4) | |||
| Replace every | Six months (all 4) | |||
| Filter type | Water | Water | Water | Air |
| Manufacturer install guide | How to Install The PureSource Ultra Water Filter (ULTRAWF) | How To Install Your PureSource Ultra II Water Filter | Not published | Not published |
| What it does | Not published | Not published | Not published | Filtering of refrigerator odors |
| Tells it apart | Twist-in, with its own Frigidaire install guide | Twist-in, the newer Ultra II fitting, documented separately | Push-in rather than twist-in, so the shape gives it away | Air, not water. A different slot entirely |
The mistake this page exists to prevent
Ultra and Ultra II read like one generation apart, so people reasonably assume the newer one drops into the older slot. Frigidaire documents them separately and tells owners to order the type already fitted, which is as close to a direct answer as its published material gets.
If the old cartridge is gone and the manual with it, the model number on the sticker inside the fresh food compartment is what Frigidaire's own lookup tool wants.
When to change it
Six months, on Frigidaire's wording, with the Water Filter Status light prompting on most models. The same article notes that a fridge left unused, during a move for instance, should get a fresh filter before it is reinstalled.
Fit it, then flush it
Air gets trapped in the line when a new cartridge goes in. Frigidaire says this can result in two or three empty ice maker cycles, and that if the system is not flushed the first ice cubes may be discolored or have an odd flavor.
Its procedure is to hold a glass against the dispenser paddle until water comes through, which it says may take about one to two minutes, keep dispensing for several minutes to flush the plumbing, then discard that water and repeat a few more times.
So cloudy or odd-tasting water straight after a change is expected rather than a sign of a bad cartridge. Flush it properly before concluding anything.
What we can source
Every row names who says it. Anything the manufacturer does not publish is not listed, which is why this is shorter than a retailer’s.
| Fits | Frigidaire French Door, Side by Side and Top Freezer refrigerators Frigidaire support |
|---|---|
| Replace every | Six months Frigidaire support |
| Filter type | Water Frigidaire support |
| Manufacturer install guide | How To Install Your PureSource Ultra II Water Filter Frigidaire support |
What Frigidaire says about third-party filters
The manufacturer marketing its own part, not an independent test. Reported, not endorsed.
“Frigidaire Genuine filters offer 3 levels of carbon filtration that trap sediment, chemicals, and harmful impurities. Frigidaire filters are NSF certified, the gold standard in water filtration.”
Common questions
- Can an EPTWFU01 replace an ULTRAWF?
- Do not assume so. Frigidaire's own advice is to order the same filter type currently in the refrigerator, and it documents the two separately.
- How often should the EPTWFU01 be changed?
- Every six months, which is the interval Frigidaire publishes across its refrigerator water filters, with the status light prompting on most models.
The bottom line
The right part if the old one says EPTWFU01. Do not treat it as an upgrade to the ULTRAWF, because Frigidaire does not document it as one.
Sources
- Frigidaire: How often should I change my water filter?
- Frigidaire: How do I know which water filter I need?
- Frigidaire: Filters and install guides
- Frigidaire: Priming the water supply system
Nothing on this page has been tested. The full write-up, with every source quoted, is in which Frigidaire filter fits.