CaribSea Arag-Alive Special Grade Reef Sand, 20-Pound
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From Carib Sea
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Most Trusted Reviews
TRUST
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Verified Purchaser
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Take-Back Reviewer (1 deleted Review; avg. rating: 5.0)
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Easy Grader (avg. rating: 4.8)
Least Trusted Reviews
TRUST
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Verified Purchaser
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Created on a high volume day
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Take-Back Reviewer (29 deleted Reviews; avg. rating: 4.7)
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Overlapping Review History: reviewed 1 of 9 top products
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Critical Reviewer (avg. rating: 4.2)
Analysis Details

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- 10%
- Created over 1 day
We counted 21 reviews for this product over the span of 1,912 days, an average of 0.0 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 1 or fewer reviews on any given day.
However, we see the following 1 day exceeding this threshold:In total, we found that 2 reviews were created on just 1 day. The reviews on these high volume days have rated this product an average of 1.0 while reviews from other days have rated this product an average of 4.6. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

Take-Back Reviewers
5 of the 21 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

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from the same brand
12 of the 21 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, the discrepancy in ratings between these reviewers and reviewers who have a more unique product review history isn't significant enough to rule out the possibility of it being due to random chance.

6 of the 21 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.

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- 0%
- Have an overrepresented word count
Read more about our Word Count Comparison test.

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- 0%
- Used substantial repetitive phrases
Read more about our Phrase Repetition test.

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- 0%
- From reviewers with an overrepresented participation
Read more about our Reviewer Participation test.

4.4 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.

Brand Repeaters

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- 0%
- Admitted to receiving an incentive
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

- 0
- Reviews have been deleted
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.