Waterspecialist WS645A Refrigerator Water Filter
- Water Filter
- 3
- 3
- 1.98 pounds
- More reviewed than 94%
A reliable, certified alternative to Samsung's OEM filter for the square HAF-QIN housing, but confirm your model is on the compatibility list first.
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How it ranks among the 81 water filters we track
4.7★ across 16,700 Amazon ratings, Bayesian-smoothed toward the category average.
16,700 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
645+ bought on Amazon 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
The Waterspecialist WS645A is a 3-pack refrigerator water filter built as a replacement for Samsung's DA97-17376B and HAF-QIN filters. It fits a specific list of Samsung French-door and Bespoke models and is not compatible with the round DA29-00020B (HAF-CIN) filter.
- Replaces Samsung DA97-17376B/HAF-QIN
- NSF 42 and 372 certified
- 6-month or 316-gallon filter life
- 3 filters included per pack
Who it's for
Suits Samsung refrigerator owners with a square HAF-QIN filter housing, listed models include RF28T5001SR, RS27T5200SR, and RF28R7351SG, who want a lower-cost replacement without giving up NSF certification. Not compatible with round HAF-CIN housings like DA29-00020B, so check your old filter's shape before buying.
What buyers say
From Amazon customer reviews.
Reviewers consistently report an easy twist-in installation and a noticeable improvement in water taste, with several calling it a reliable, cheaper alternative to Samsung's own filter. One owner flags a genuinely useful tip: shut off the water supply before removing the old filter, or the twist-out step sprays water everywhere. A couple of reviewers note the filter can be tricky to seat correctly the first time, though it works properly once in place.
Strengths and trade-offs
Drawn from this product's published specifications.
- NSF 42 and 372 certified filtration
- Twist-in install, no tools required
- Noticeably improves water taste per reviewers
- 3-pack covers roughly 18 months of use
- Only fits square HAF-QIN housings, not round HAF-CIN
- Can be fiddly to seat correctly at first install
- 6-month replacement cycle adds ongoing cost
Performance notes
A coconut shell carbon block does the filtering, which Waterspecialist positions as offering more surface area and micropores than generic carbon for reducing chlorine, taste, and odor. NSF 42 and 372 certification cover taste/odor reduction and lead-free housing material respectively, tested by an independent lab rather than self-reported. Rated life is 6 months or 316 gallons, whichever comes first, with a date sticker included to track replacement timing.
Specifications
| Brand | Waterspecialist |
|---|---|
| Model | WS645A |
| Dimensions & fit | |
| Item Weight | 1.98 pounds |
| Item Dimensions D x W x H | 7.3 × 2.5 × 8 inches |
| Construction & materials | |
| Material Type | Lead-Free Material, Food-Grade Material, Advanced Activated Coconut Carbon Block |
| Compatibility & installation | |
| Compatible Refrigerator Models | Samsung BRF425200AP, Samsung RF18A5101SR, Samsung RF20A5101SR, Samsung RF23A9071SG, Samsung RF23A9071SR, Samsung RF23A9671SG, Samsung RF23A9671SR, Samsung RF23A967512, Samsung RF23A9771SG, Samsung RF23BB8200AP, Samsung RF23BB86004M, Samsung RF23M8590SG, Samsung RF23M8960S4, Samsung RF23R6201SG, Samsung RF23R6301SR, Samsung RF24BB660012, Samsung RF24BB69006M, Samsung RF24BB6900AC, Samsung RF24BB6900AW, Samsung RF27T5241SG, Samsung RF28R6241SR, Samsung RF28R6301SG, Samsung RF28R7201DT, Samsung RF28R7201SR, Samsung RF28R7351SG, Samsung RF28R7351SR, Samsung RF28R7551SG, Samsung RF28T5101SR, Samsung RF28T5101WW, Samsung RF28T5F01SR, Samsung RF29A9671SG, Samsung RF29A9675AP, Samsung RF29BB820012, Samsung RF29BB8200AP, Samsung RF29BB8600AP, Samsung RF29BB8900AC, Samsung RF30BB620012, Samsung RF30BB6200AP, Samsung RF30BB6200QL, Samsung RF30BB6600QL, Samsung RF30BB6602QL, Samsung RF32CG5100SR, Samsung RF32CG5400SR, Samsung RF32CG5900SR, Samsung RS25H5111WW, Samsung RS27T5200WW, Samsung RS27T5201SR, Samsung RS28A5F61SG, Samsung RS28CB760012, Samsung RS28CB7600QL |
| Included components | |
| Unit Count | 3 |
| Included Components | Month Install Stickers, Refrigerator Water Filter Replacement*3, User's Manual*1 |
| Warranty & support | |
| Manufacturer Warranty Description | Lifetime |
| Other details | |
| Number of Items | 3 |
| Item Type Name | for Samsung DA97-08006C, HAF-QIN, HAF-QIN/EXP |
| Product Benefits | Effectively reduces various harmful substances while improving taste and odor of water |
| External Testing Certification | NSF |
| Set Name | Pack of 3 |
Other Waterspecialist water filters
How it compares
This product against the closest alternatives we track in water filters.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Waterspecialist WS645A Refrigerator Water FilterThis product | 4.7 / 5 | 16,700 | 4.4 / 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 Waterspecialist WS645A
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Will the Waterspecialist WS645A fit a Samsung fridge that uses DA29-00020B?
No. DA29-00020B is the round HAF-CIN filter, and the WS645A is built for the square HAF-QIN housing, so the two are not interchangeable.
Which Samsung refrigerator models does the WS645A fit?
Listed compatible models include RF28T5001SR, RS27T5200SR, RF28R7351SG, RF24R7201SR, and RF27T5201SR, among others sharing the HAF-QIN housing.
How often should the WS645A filter be replaced?
Waterspecialist rates it for 6 months or 316 gallons, whichever comes first, and includes a date sticker to track it.