Compare Under Sink Water Filter
Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 scores higher on safety - here's why.
R3 scored the Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 9.3/10 and the Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter System 9.0/10 on the same under sink water filter scoring system, weighing safety, efficacy, and usability. The Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 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 Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 vs Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter System.
Unlock the full Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 vs Aquasana OptimH2O Reverse Osmosis + Claryum Under Counter Water Filter 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 rent or live in a condo and can't drill through your counter — the AQ-5200 uses your existing soap dispenser hole, no new hole required.
PFAS is your top concern and you want a certification you can independently verify — NSF P473 via WQA is publicly searchable.
You want the environmental benefit of no wastewater — unlike RO systems, this filter doesn't pour gallons down the drain.
You want a PFAS-certified system under $250 — the AQ-5200 is among the most affordable systems with this certification stack.
You need NSF P473 — the PFAS-specific certification — combined with NSF 53 lead coverage, NSF 401 emerging contaminants, and NSF 58 comprehensive RO in a single under-sink system.
You want full test transparency: Aquasana's certified products page lets you verify every contaminant claim before you buy.
You're comfortable with semi-annual filter replacements and building that maintenance habit in exchange for the deepest certification profile in the category.
Your household water has documented PFAS, lead, chloramine, or emerging contaminant concerns that require formal NSF certification to address.
The main thing to know
The AQ-5200 earns its Exceptional score by doing something rare: full PFAS certification (verifiable at wqa.org), 100% water recovery (no wastewater like RO systems), and no-drill installation that renters can realistically do — all for $249. The honest tradeoff is filter life. At 500 gallons, you're changing filters every 7–8 months and spending about $108 per year. If you can live with that cadence, this is the best-value certified PFAS-removal under-sink filter available for renters and condo owners. The only system that beats it in this category is Clearly Filtered, which offers a 2,000-gallon filter life but costs more upfront.
The OptimH2O's Exceptional rating comes from its certification depth, not its maintenance convenience. NSF P473 — the PFAS-specific standard — plus four other NSF certifications is the broadest certified coverage in this category. The honest tradeoff is the pre-filter: 365 gallons means roughly twice-yearly replacements at roughly $211 per year. That's the real cost of this system's certification breadth. If that schedule fits your routine, the safety credentials are the strongest available in a DIY under-sink format.
Skip this if you...
You don't want to change filters every 7–8 months — Clearly Filtered's 2,000-gallon filter system lasts nearly 3x longer per cartridge.
You want the lowest annual filter cost — systems with longer filter life cost less per year to maintain.
You have unused counter space and are open to a countertop RO system — AquaTru's RO systems offer higher overall contaminant reduction at comparable cost.
Frequent filter changes feel unmanageable — at standard household usage the pre-filter needs replacing every 6 months.
You're optimizing for low annual running cost — roughly $211 per year in filter replacements is above average for an under-sink system.
You want a simple install without drilling a new hole — the dedicated faucet requires a new hole in your sink deck or counter.
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 Aquasana and Aquasana 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 Aquasana Aquasana Claryum 2-Stage Under Counter Water Filter System AQ-5200 - it scored 9.3/10 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
