Compare Countertop Water Filter
Which scores higher on safety? R3 breaks it down.
R3 scored the Big Berkey 2.25-Gallon Gravity-Fed Stainless Steel Water Filter System 6.6/10 and the ProOne Big+ Gravity-Fed Stainless Steel Water Filter (3.25-gallon) 6.6/10 on the same countertop water filter scoring system, weighing safety, efficacy, and usability. The overall scores are close; the pillar breakdown below shows where they differ.
The most important dimensions, side by side.
See which one actually scores higher — and why
Free account unlocks full safety scores, spec-by-spec breakdown, and the R3 verdict on Big Berkey 2.25-Gallon Gravity-Fed Stainless Steel Water Filter System vs ProOne Big+ Gravity-Fed Stainless Steel Water Filter (3.25-gallon).
Unlock the full Big Berkey 2.25-Gallon Gravity-Fed Stainless Steel Water Filter System vs ProOne Big+ Gravity-Fed Stainless Steel Water Filter (3.25-gallon) breakdown
Free account unlocks all safety scores, complete spec comparison, scoring rationale, and the R3 verdict on which one to buy.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
You use Black Berkey elements ONLY (no PF2) — this eliminates the aluminum leaching source, though fluoride reduction is then unverified.
Emergency preparedness or off-grid use where filter longevity and electricity independence are the primary requirements.
You have access to your own independent Tap Score testing to verify output water quality for your specific water source.
You want the largest capacity (3.25 gallons) with no electricity requirement — renter-friendly and emergency-ready.
Mineral preservation matters — gravity-fed ceramic/carbon filters do not demineralize water.
Your water quality testing shows no documented PFAS, lead, or health-effects contaminant issues above EPA action levels.
304 stainless steel construction (no plastic water contact in the chamber) is a priority.
The main thing to know
Big Berkey ranks last in this category due to documented aluminum oxide leaching from its PF2 fluoride filter at 1.4 PPM above Tap Score's Health Guidance Level — combined with Duke 2020 PFAS failure and zero NSF certification. The 6,000-gallon filter life and electricity independence are genuine practical advantages. R3 does not recommend Big Berkey as a primary daily drinking water filter until the aluminum leaching issue is resolved or PF2 filters are removed.
ProOne Big+ ranks third — not because of weak physical build quality (the 304 stainless steel chamber and sub-0.2 micron ceramic element are genuine strengths) but because NSF 42-only formal certification leaves critical safety questions unverified for households with PFAS, lead, or emerging contaminant exposures. The capacity, construction quality, and mineral preservation make it the strongest gravity-fed option in the seed set; the certification gap is the non-negotiable limitation.
Skip this if you...
You're using or plan to use PF2 fluoride filter elements — the documented aluminum leaching above Health Guidance Levels is a chronic daily consumption risk.
Your water has PFAS, lead from service lines, or other documented contamination — NSF certification is the required consumer protection standard.
You live in California — most Berkey models are banned due to lack of NSF certification.
Any of Mamavation, EWG, IRLFY, or GtGS recommendations matter to your purchasing decision — all four explicitly do not recommend Berkey.
Your water has documented PFAS, lead, or emerging contaminant issues — ProOne's NSF 42-only formal certification is insufficient for verified health-effects protection in these cases.
Fast fill time is important — gravity-fed systems take 2+ hours per gallon.
You want independent Tap Score data from WFG specifically covering ProOne's output.
Neither of these quite what you're looking for?
I've reviewed all Countertop Water Filter options at every price pointEvery Countertop Water Filter in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Berkey and ProOne (AquaCera) across 3 independent criteria: Safety (93%), Efficacy (5%), Usability (2%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
Both scored close to 6.6/10, so the better choice depends on your priorities. Safety is our top-weighted scoring pillar, followed by efficacy, and usability. Check which pillar matters most to your family and compare those specific scores.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Countertop Water Filter across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
Not necessarily. The overall score reflects how we weight those three pillars, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
Not the right match? Explore these alternatives in the same category.
AquaTru
AquaTru Classic Countertop Reverse Osmosis Water Filter
9.0
AquaTru
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ProOne (AquaCera)
ProOne Big+ Gravity-Fed Stainless Steel Water Filter (3.25-gallon)
6.6
AquaTru
AquaTru Carafe Countertop Reverse Osmosis Water Filter (Glass)
9.0
