Culligan CUW4 Refrigerator Water Filter Replacement for Whirlpool Water Filter 4
- Water Filter
- Plastic
- 1
- 1
A cheaper alternative to the OEM Whirlpool Filter 4 that fits most compatible fridges without issue, but confirm your exact model given at least one documented fit and leak problem.
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How it ranks among the 81 water filters we track
4.2★ across 576 Amazon ratings, Bayesian-smoothed toward the category average.
576 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 81 water filters we track - how the scorecard works · full water filters data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 15, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A refrigerator water filter made as a compatible replacement for Whirlpool Filter 4 (EDR4RXD1/WHR4RXD1), fitting select Whirlpool, JennAir, KitchenAid and Maytag french door and side-by-side models. Rated for about 6 months of use.
- Replace every 6 months
- NSF/ANSI 42, 53, 401 certified
- Reduces lead and 8 pharmaceuticals
- Compatible fit, not OEM manufactured
Who it's for
Suits owners of compatible Whirlpool, JennAir, KitchenAid or Maytag refrigerators who want a lower-cost alternative to the OEM EDR4RXD1 filter. Skip it if your exact model is one where the aftermarket fit has run loose, or you can't tolerate any leak risk during a swap.
What buyers say
From Amazon customer reviews.
Most buyers report an easy install, no leaks, and water that tastes noticeably better than tap. One reviewer had a genuine fit problem, describing the filter as shorter and narrower than the factory unit with reversed water ports and no forward latch lock, which caused leaking in their specific refrigerator model.
Strengths and trade-offs
Drawn from this product's published specifications.
- Compatible with Whirlpool EDR4RXD1 and WHR4RXD1
- Fits select JennAir, KitchenAid, Maytag models
- Reduces chlorine taste and odor
- Lower cost than the OEM filter
- Aftermarket fit reported loose on some models
- Brief leaking during initial installation for some
- Not the OEM Whirlpool part
Specifications
| Brand | Culligan |
|---|---|
| Model | CUW4 |
| Dimensions & fit | |
| Item Weight | 9.6 ounces |
| Item Dimensions D x W x H | 3 × 3 × 9 inches |
| Construction & materials | |
| Material Type | Plastic |
| Included components | |
| Unit Count | 1 |
| Included Components | Replacement Refrigerator Water Filter |
| Other details | |
| Number of Items | 1 |
| Item Type Name | Refrigerator Water Filter |
| Product Benefits | Filters 50 impurities including lead, asbestos, chlorine taste/odor, 8 pharmaceuticals, and cysts |
| External Testing Certification | NSF, ANSI |
| Set Name | CUW4 |
How it compares
This product against the closest alternatives we track in water filters.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Culligan CUW4 Refrigerator Water Filter Replacement for Whirlpool Water Filter 4This product | 4.2 / 5 | 576 | 3.7 / 5 |
| Frigidaire ULTRAWF Water Filter & PAULTRA Air Filter Combo PackFrigidaire | 4.7 / 5 | 12,500 | 4.7 / 5 |
| Waterdrop UKF8001 Refrigerator Water Filter 4Waterdrop | 4.8 / 5 | 9,400 | 4.6 / 5 |
| PUREPLUS ADQ747935 Replacement for LG LT1000P LT1000 Kenmore Elite 9980 LT1000PCPureplus | 4.6 / 5 | 9,800 | 4.5 / 5 |
| ICEPURE DA2900020B Refrigerator Water Filter Replacement for Samsung DA2900020AIcepure | 4.7 / 5 | 7,800 | 4.5 / 5 |
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Questions about the Culligan CUW4
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the Culligan CUW4 fit the Whirlpool EDR4RXD1 filter slot?
Yes, it's built as a compatible replacement for Whirlpool Filter 4 (EDR4RXD1 and WHR4RXD1), and most reviewers report an easy swap.
How often should the Culligan CUW4 be replaced?
Culligan recommends replacing it about every 6 months.
Has anyone reported leaks with the Culligan CUW4?
One reviewer reported a poor fit and leaking in their specific refrigerator model, though most others reported no leaks after installation.