Tools & Home Improvement
Royal Berkey Gravity-Fed Stainless Steel Countertop Water Filter System 3.25 Gallon with 2 Authentic Black Berkey Elements BB9-2 Filters
Bias-adjusted across 478 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Tools & Home Improvement.
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How the score was built
- Amazon ratings
- 478
- Raw star average
- 4.5 / 5
- Bayesian avg
- 4.46
used for the Bayesian percentile
unadjusted Amazon mean
raw rating shrunk to the category prior
Buy it: View on Amazon →
Same category · Tools & Home Improvement
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