Quick answer: The Aquasana Claryum 3-Stage Max Flow (AQ-5200+) is the better pick for most kitchens, combining claimed 97+ contaminant reduction with a compact, tankless design that needs no electricity or drain saddle. Step down to the 2-Stage Claryum (AQ-5300+) as the runner-up if you want the same core carbon filtration in a smaller housing at a lower price and do not need PFAS-specific certification.
Aquasana Claryum Under-Sink Models Compared
| Feature | Claryum 2-Stage (AQ-5300+) | Claryum 3-Stage Max Flow (AQ-5200+) |
|---|---|---|
| Filtration stages | 2 stages | 3 stages |
| Claimed contaminants reduced | 77+, including chlorine, lead, mercury | 97+, including PFOA/PFOS, chlorine, lead, mercury, herbicides |
| Flow rate | 0.5 gallons per minute | 0.5 gallons per minute |
| Filter lifespan | Up to 600 gallons / 6 months | Up to 800 gallons / 6 months |
| Power or drain line needed | No | No |
| Certifications | NSF/ANSI 42, 53 | NSF/ANSI 42, 53, 401, P473 |
| Price range | $120-$150 | $190-$230 |
| Best for | Budget buyers who mainly want chlorine and lead reduction | Households wanting broad reduction of emerging contaminants like PFAS |
Who Should Buy the Aquasana Under-Sink Filter
The Claryum line is built for anyone who wants noticeably better-tasting tap water without giving up counter or cabinet space to a bulky reverse osmosis tank. Because it is a carbon-and-sub-micron system rather than a membrane-based reverse osmosis unit, it does not waste water, does not need an electrical outlet or a dedicated drain line, and delivers filtered water at close to full tap pressure. That makes it a strong fit for renters, small kitchens, and anyone who wants a straightforward, low-maintenance upgrade over a pitcher filter.
It is a less ideal fit if your water report shows high total dissolved solids, heavy sediment, or you specifically want reverse osmosis-level reduction of dissolved salts and minerals. For that, a membrane-based system is the better tool; see our reverse osmosis buying guide for how RO differs from the carbon block filtration Aquasana uses, or browse our best under-sink water filters roundup for a wider comparison across both filtration types.
Check Claryum 3-Stage Price on Amazon
Filtration Performance: What It Actually Removes
Aquasana's Claryum technology combines activated carbon with a sub-micron filtration mechanism designed to trap contaminants without a membrane. The 2-Stage model is certified to NSF/ANSI 42 for chlorine taste and odor and NSF/ANSI 53 for health-related contaminants including lead and mercury. The 3-Stage Max Flow adds NSF/ANSI 401 certification, which covers emerging contaminants such as pharmaceuticals, herbicides, and pesticides, plus P473 certification specifically for PFOA and PFOS reduction. If PFAS is a concern in your area, the 3-stage model is worth the extra cost; our PFAS water filter guide breaks down which certifications matter most for that specific contaminant class and how to read a Certificate of Analysis.
Unlike reverse osmosis, Claryum filtration does not strip beneficial minerals from the water or produce wastewater, so there is no waste ratio to weigh against output the way there is with an RO system. The trade-off is that it will not meaningfully reduce total dissolved solids or water hardness; if your goal is softer water rather than cleaner-tasting water, a dedicated water softener addresses that separately, since the two problems require different technology entirely.
In practical terms, most households notice the difference in taste and odor within the first few glasses, since chlorine and chloramine byproducts are the contaminants people are most sensitive to by smell and flavor. Lead and mercury reduction matters more for health than taste, and those numbers are the ones worth checking against your local water quality report before you decide which of the two models to buy.
Installation: How Hard Is It Really
Both Claryum models mount to the cold water line under the sink using an included dedicated faucet, T-valve, and quick-connect tubing. Aquasana rates the install at under an hour for most kitchens, and no drilling is required if your sink already has a spare hole for a soap dispenser or sprayer, since the included faucet can often use that opening. If your sink does not have a spare hole, you will need to drill through the counter or sink deck, which is the most common sticking point reported by installers, especially on granite or solid-surface counters where a specialty bit is needed. The system needs no electrical outlet and no separate drain line, which meaningfully simplifies installation compared to an RO system that requires a drain saddle clamped to your existing drain pipe. For a step-by-step walkthrough that applies to most under-sink systems, including this one, see our under-sink water filter installation guide.
Budget roughly 45 minutes to an hour if your sink already has a spare hole, and closer to two hours, plus the cost of a hole saw or step bit, if you need to drill one. Shutting off the cold water supply valve under the sink before you start, and keeping a towel handy for the small amount of water that drains from the existing line, covers the two most common first-time installation mistakes.
Filter Replacement and Long-Term Costs
Aquasana rates both Claryum cartridges for six months or their respective gallon capacity, whichever comes first, which is a shorter interval than some competing carbon block systems that stretch to twelve months. Replacement filters typically run $50-$70 per twin-pack, which puts annual filter costs in the $100-$140 range depending on which model you own. That is higher than budget pitcher filters but in line with, or slightly below, the annual cost of maintaining a comparable reverse osmosis system once you account for RO's periodic membrane replacement. Aquasana also offers a filter subscription that ships replacements automatically on the six-month cycle, which is worth setting up since a forgotten filter change is the most common reason performance complaints show up in reviews.
Check Claryum 2-Stage Price on Amazon
How It Compares to Other Under-Sink Systems
Against reverse osmosis competitors like the iSpring RCC7AK or Waterdrop G3, the Claryum line trades raw contaminant-reduction breadth for simplicity and lower waste. RO systems typically reduce total dissolved solids and a wider range of dissolved inorganics, but they need a storage tank or a pump, produce wastewater, and require periodic membrane replacement in addition to pre-filters. Claryum is the simpler, lower-maintenance option if your priority is chlorine taste, lead, and, on the 3-Stage model, PFAS reduction, rather than comprehensive TDS reduction. If you are still deciding between filtration types, the iSpring RCC7AK and Waterdrop G3 cover the RO side of that comparison in detail.
Aquasana's under-sink Claryum line is also a different product category from the company's whole-house systems. If your concerns are house-wide, such as chlorine odor throughout every tap or hard water affecting appliances, the under-sink filter will not address that; our Aquasana vs SpringWell comparison covers the whole-house side of the lineup. The under-sink Claryum is specifically for drinking and cooking water at one tap, not the water running through your showers and laundry.
Common Complaints and What to Watch For
The most consistent complaint in user feedback is a drop in flow rate over the final weeks before a filter change, which is expected behavior as the cartridge loads up with captured contaminants rather than a defect. Sticking to the six-month replacement schedule, or replacing early in households on well water or with heavy sediment, prevents most of this. A smaller number of buyers report difficulty finding a spare sink hole for the faucet, which is worth checking before you buy rather than after the box arrives. Reported leaks are typically traced to the quick-connect fittings not being fully seated during installation rather than a product defect, and are usually solved by reseating the tubing and confirming the water is fully shut off before you tighten anything.
A few buyers also note that the dedicated faucet's finish options are more limited than what full kitchen faucet brands offer, which is worth checking if matching your existing fixtures matters to you. None of these are dealbreakers for most households, but they are worth knowing before you unbox the system rather than discovering them mid-install.
Maintenance Checklist for Claryum Owners
Keeping a Claryum system performing at its rated level comes down to a few habits. Mark your filter change date on a calendar or set up the subscription service so replacements arrive automatically before the six-month mark. Run the faucet for 30 seconds after installing a new cartridge to flush out carbon fines, which is normal and not a sign of a defective filter. Periodically check the quick-connect fittings under the sink for slow seepage, especially after any plumbing work nearby that might have jostled the lines. And if flow noticeably slows before the six-month mark, treat that as a sign to replace early rather than waiting out the full interval, particularly on well water with higher sediment loads.
Frequently Asked Questions
Yes, if PFAS, herbicides, or pesticides are a concern in your local water supply, since only the 3-Stage Max Flow carries NSF/ANSI 401 and P473 certifications for those contaminants. If your main concern is chlorine taste and lead, the 2-Stage model covers those at a lower price.
No. Claryum filtration uses activated carbon and sub-micron filtration, not ion exchange, so it does not soften water or meaningfully change total dissolved solids. Pair it with a dedicated water softener if hardness is also a concern.
Aquasana rates both Claryum cartridges for six months or up to their listed gallon capacity, whichever comes first. Households on well water or with heavy sediment should plan to replace slightly earlier.
Most kitchens can be done in under an hour with basic tools, especially if the sink already has a spare hole for the included faucet. If you need to drill a new hole through a stone or solid-surface counter, hiring a plumber for that one step is a reasonable option.
No. Because Claryum filtration is carbon-based rather than membrane-based, it produces no wastewater, unlike RO systems that typically discharge several gallons of drain water for every gallon of filtered water produced.
Upfront cost is lower than most RO systems, and annual filter costs of $100-$140 are similar to or slightly below typical RO maintenance once membrane replacement is factored in. The main trade-off is narrower contaminant coverage, not price.
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