Culligan CUW4 Water Filter Review
Our verdict
The Culligan CUW4 is a single replacement filter carrying NSF and ANSI certifications, priced at $25.49. It has a meaningful review base of 576 ratings and earns a 4.2-star average, suggesting reliable performance for most buyers though some variation exists.
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Budget-conscious shoppers who want an NSF and ANSI certified single-unit replacement from an established brand
Skip if
You need compatibility confirmed for your specific refrigerator model, or you require listed contaminant reduction percentages
- Certification Nsf, Ansi
- Pack 1
- Material Plastic
- Dimensions 3 X 3 X 9 In
- Weight 9.6 lb
- Pack of 1 - fewer than 64% of the 140 models we track
- Weight of 9.6 lb - heavier than 85% of the 140 models we track
Our scorecard
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Owner rating4.2/5
4.2 average across 576 owner ratings
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Popularity2.0/5
576 owner reviews, fewer than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other water filtration: replacement filters, under-sink and reverse osmosis systems, filter pitchers, water dispensers, coolers, faucet filters and softeners we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The Culligan CUW4 stands out in this group for carrying both NSF and ANSI certifications, which means it has been independently tested against recognized standards for water filter components. At $25.49 per filter, the price is competitive for a certified single-unit replacement from a name-brand company.
Physically, the CUW4 measures 3 by 3 by 9 inches and weighs 9.6 pounds. That weight is notable for a single water filter and likely reflects the housing and packaging rather than the filter media alone. The plastic construction is standard for this filter type.
With 576 reviews and a 4.2-star average, the CUW4 has a solid sample size. The rating is a touch lower than some competitors in this batch, which suggests a portion of buyers encountered fit or performance issues, though the majority still rate it positively.
Pros
- NSF and ANSI certified for independently verified standards
- Competitive price at $25.49 for a certified replacement
- 576 reviews provide a meaningful feedback base
- Culligan brand with broad customer recognition
Cons
- 4.2-star average is lower than several comparable options
- Compatible refrigerator models not listed in product data
- No capacity or filter life spec published
- No specific contaminant reduction percentages available
Specifications
| Certification | Nsf, Ansi |
|---|---|
| Pack | 1 |
| Material | Plastic |
| Dimensions | 3 X 3 X 9 In |
| Weight | 9.6 lb |
Performance notes
The CUW4 is certified to NSF and ANSI standards, indicating independent testing against recognized benchmarks for water filter components. No specific contaminant reduction data, purification method, or capacity spec is available in the listing. NSF and ANSI certification together generally cover material safety and structural integrity at minimum, but the exact certification standard numbers (such as NSF 42 or NSF 53) are not confirmed in available data, which limits detailed performance comparison.
What buyers say
With 576 ratings averaging 4.2 stars, the CUW4 has a broad enough review pool to treat the rating as meaningful. Most buyers are satisfied, but the 4.2 average, somewhat below the 4.5 to 4.7 range of competing models, suggests a noticeable minority experienced installation or performance issues worth noting.
Similar water filtration: replacement filters, under-sink and reverse osmosis systems, filter pitchers, water dispensers, coolers, faucet filters and softeners to consider
Frequently asked questions
What certifications does the Culligan CUW4 carry?
The CUW4 is listed with NSF and ANSI certifications. These indicate the filter has been tested by an independent organization against established standards for water treatment components. The specific standard numbers, such as NSF 42 for taste and odor or NSF 53 for health-related contaminant reduction, are not confirmed in the available data, so check the product documentation for the full certification scope.
How large is the Culligan CUW4?
The CUW4 measures 3 by 3 by 9 inches and is listed at 9.6 pounds. That weight is higher than many refrigerator filters, which typically weigh well under a pound of filter media. The weight likely includes the outer packaging or housing. Confirm the physical dimensions against your fridge filter compartment before ordering.
How does the CUW4 compare to other Culligan refrigerator filters?
Culligan offers several refrigerator filter models, each targeted at different fridge brands and housing styles. The CUW4 is a single-unit purchase at $25.49. If your fridge accepts a HAF-style or other specific housing, a different Culligan model may be the right fit. Cross-referencing the model number from your fridge's filter compartment is the most reliable way to confirm compatibility across any Culligan product.