Compare Under Sink Water Filter
Clearly Filtered 3-Stage Under-the-Sink Water Filtration System scores higher on safety - here's why.
R3 scored the AquaTru Under-Sink Reverse Osmosis System 8.9/10 and the Clearly Filtered 3-Stage Under-the-Sink Water Filtration System 10.0/10 on the same under sink water filter scoring system, weighing safety, efficacy, and usability. The Clearly Filtered 3-Stage Under-the-Sink Water Filtration System comes out ahead.
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 AquaTru Under-Sink Reverse Osmosis System vs Clearly Filtered 3-Stage Under-the-Sink Water Filtration System.
Unlock the full AquaTru Under-Sink Reverse Osmosis System vs Clearly Filtered 3-Stage Under-the-Sink Water Filtration System 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 specifically want reverse osmosis technology — the most proven method for removing the widest range of contaminants including PFAS, nitrates, and dissolved solids
You already have a spare faucet hole in your sink, or you're comfortable with a one-time drilling job to install the dedicated faucet
You value having Mamavation's independent real-world PFAS verification on top of the standard NSF certification
You want the most rigorously documented PFAS and contaminant protection available in an under-sink filter and are willing to invest in it
You live in a rental or don't want to drill a new faucet hole — the inline installation works with your existing setup
You want zero water waste and don't need a reverse osmosis system to feel confident in your water quality
The main thing to know
AquaTru doesn't disclose how many gallons their filters handle — only a time-based schedule. That makes it impossible to calculate your true annual filter cost or know if the replacement schedule fits your household's actual water consumption.
At $495 upfront, this is one of the more expensive under-sink filters on the market — but the filter replacements are annual at the 2,000-gallon life, and no competing filter matches the combination of NSF 473 PFAS certification, 232-contaminant independent verification, and no-drill installation.
Skip this if you...
You want to track and optimize filter replacement by gallons used rather than following a time-based calendar
You live in a drought-affected area and want to minimize water waste — RO systems send water down the drain, and AquaTru doesn't disclose the ratio
You need a no-drill installation because you rent or prefer not to modify your plumbing setup
You're on a tight budget and need a more affordable entry point — consider the Clearly Filtered pitcher while saving up
You need a guaranteed published flow rate because multiple family members will be drawing filtered water simultaneously
You prefer reverse osmosis technology specifically and don't mind the installation complexity it requires
Neither of these quite what you're looking for?
I've reviewed all Under Sink Water Filter options at every price pointEvery Under Sink 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 AquaTru and Clearly Filtered across 3 independent criteria: Safety (68%), Efficacy (31%), Usability (1%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
I'd start with Clearly Filtered Clearly Filtered 3-Stage Under-the-Sink Water Filtration System - it scored 10.0/10 overall in our scoring system. 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 Under Sink 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.
Aquasana
Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter System
9.0
Clearly Filtered
Clearly Filtered 3-Stage Under-the-Sink Water Filtration System
10.0
Hydroviv
Hydroviv Under Sink Water Filter
3.5
Clearly Filtered
Clearly Filtered 3-Stage Under-the-Sink Water Filtration System
10.0
