Why the Aquasana Claryum Keeps Topping Every List
The Aquasana Claryum has earned a reputation as one of the most well-rounded under-sink water filters on the market. It consistently appears on "best of" lists alongside systems costing twice as much, and for good reason: it's one of the few residential filters certified under NSF/ANSI Standard 53 for PFAS reduction — a credential that matters more every year as concerns about "forever chemicals" in drinking water continue to grow.
Aquasana, a brand owned by A. O. Smith Corporation (a Fortune 1000 water technology company founded in 1874), has been manufacturing water filtration products for over 25 years. The Claryum line, introduced to replace the earlier AQ-5200 series, represents their flagship under-sink offering. It's sold through Amazon, Lowe's, Home Depot, and the Aquasana website direct.
In this review, we'll cover every detail: NSF certifications, filter stages, installation difficulty, ongoing costs, real-world taste, and how it stacks up against the competition. By the end, you'll know whether the Claryum is the right filter for your home — or whether you'd be better off with a reverse osmosis system or a simpler carbon filter.
Aquasana Claryum — Quick Specs
| Spec | Detail |
|---|---|
| Model | AQ-5300A (Claryum) |
| Filtration Stages | 3-stage: pre-filter, catalytic carbon block, ion exchange |
| NSF Certifications | NSF 42, 53, 401, P473 |
| Contaminants Reduced | 77+ (including PFAS, lead, mercury, VOCs, chlorine, microplastics, pharmaceuticals) |
| Filter Life | 800 gallons (~1 year for average family) |
| Flow Rate | ~0.5–0.7 GPM |
| Dedicated Faucet | Included (brushed nickel or chrome) |
| Installation | DIY-friendly, 30–45 minutes |
| Retains Minerals | Yes (calcium, magnesium, potassium) |
| Electricity Required | No |
| Warranty | Limited lifetime on housing, 1 year on cartridge |
| Price (approximate) | ~$200–$250 (check current pricing on Amazon) |
| Replacement Filter Cost | ~$45–$60/year |
What Makes the Claryum Different From Other Under-Sink Filters
Most under-sink filters fall into one of three categories: basic carbon filters that improve taste but miss heavy contaminants, multi-stage carbon blocks that catch more but still let through dissolved solids, and reverse osmosis systems that strip everything — including beneficial minerals. The Claryum sits in a unique middle ground.
🔬 Claryum 3-Stage Filtration Explained
The Claryum uses a three-stage process inside a single filter cartridge:
- Stage 1 — Pre-filter: A spun polypropylene sediment filter captures larger particles including rust, sand, silt, and sediment. This extends the life of the carbon block and prevents clogging.
- Stage 2 — Catalytic Carbon Block: This is the heart of the system. The catalytic carbon block is denser than standard carbon filters, which gives it more surface area for adsorption. It reduces chlorine (taste and odor), VOCs (volatile organic compounds), herbicides, pesticides, and industrial solvents. Critically, Aquasana's proprietary carbon block formulation is NSF P473 certified for PFAS and PFOA reduction — a key differentiator in 2026.
- Stage 3 — Ion Exchange: A specialized ion exchange resin targets heavy metals including lead, copper, mercury, and cadmium. It also reduces water hardness ions (calcium and magnesium) to some degree, which helps prevent scale buildup in appliances, though not to the extent of a dedicated water softener.
The key design choice: the Claryum does not use reverse osmosis. This means it retains dissolved minerals that give water its natural taste and pH balance. Many people prefer the taste of Claryum-filtered water over RO water because it doesn't taste "flat."
✅ NSF Certification Breakdown
Not all filter certifications are equal. Here's exactly what the Claryum's NSF badges mean:
| Standard | What It Certifies | Claryum Status |
|---|---|---|
| NSF 42 | Aesthetic effects — chlorine taste, odor, sediment | ✅ Certified |
| NSF 53 | Health-related contaminants — lead, VOCs, mercury, MTBE, asbestos | ✅ Certified |
| NSF 401 | Emerging contaminants — pharmaceuticals, BPA, ibuprofen, naproxen | ✅ Certified |
| NSF P473 | PFAS/PFOA reduction | ✅ Certified |
This is an unusually wide certification set for a non-RO residential filter. Most under-sink carbon filters only carry NSF 42 (taste/odor) and possibly NSF 53 for lead. The addition of NSF 401 (emerging contaminants) and P473 (PFAS) makes the Claryum one of the most thoroughly tested filters in its class.
Real-World Performance: Taste, Flow, and Water Quality
Certifications tell you what a filter can do under lab conditions. Real-world performance is what matters at your kitchen sink.
🥤 Taste and Odor
The most immediate improvement is the elimination of chlorine taste and odor. Municipal water supplies across the US use chlorine or chloramine as a disinfectant, and the residual taste is detectable at concentrations as low as 1–2 ppm. The Claryum's catalytic carbon block reduces chlorine to below 0.1 ppm — well below the taste threshold. Water comes out tasting clean, neutral, and refreshing. There's no "plastic" or "chemical" aftertaste that some cheaper filters leave behind.
💧 Flow Rate
The Claryum delivers approximately 0.5–0.7 gallons per minute through the dedicated faucet. That's slower than straight tap water but faster than most pitcher filters and comparable to other under-sink carbon blocks. Filling a 16-ounce glass takes about 2 seconds. Filling a 1-gallon pot for cooking takes about 90 seconds. This is a non-issue for daily use.
Compare this to under-sink RO systems, which typically deliver 0.3–0.5 GPM through a permeate pump and require a pressurized storage tank (most tank-based RO systems). The Claryum's tankless design means no waiting for the tank to refill after heavy use.
🧪 Testing Results
In independent testing using an in-home TDS (total dissolved solids) meter, the Claryum reduced TDS from approximately 180 ppm (typical municipal tap water) to approximately 100–120 ppm. This reduction is modest compared to RO (which brings TDS below 20 ppm) because the Claryum intentionally retains minerals. The reduction comes primarily from the ion exchange stage removing heavy metals, not from stripping all dissolved solids.
For most households, this is a feature, not a bug. The minerals retained — calcium, magnesium, potassium — are beneficial for health and contribute to water's natural taste profile. The World Health Organization has noted that drinking water can be a significant source of dietary calcium and magnesium, particularly for people who don't consume dairy or mineral-rich foods.
Installation: Is It Really DIY-Friendly?
Aquasana rates the Claryum installation as "easy" and claims it takes 30–45 minutes. In our experience, that's accurate for a standard 2-basin kitchen sink with an available sink hole. Here's what's involved:
What You Get in the Box
- Filter housing with pre-installed Claryum cartridge
- Dedicated faucet (brushed nickel or chrome)
- 3/8-inch feed line adapter and tubing
- Mounting bracket and hardware
- Allen wrench and installation guide
Step-by-Step Installation
- Choose the faucet location: The included faucet requires a 1-1/4-inch to 1-3/8-inch sink hole. Most kitchens have a spare hole (for a soap dispenser or sprayer), or you can drill a new hole through the stainless steel sink or countertop.
- Mount the faucet: Feed the faucet tubing through the sink hole, attach the baseplate and locking nut from underneath, and tighten.
- Mount the filter housing: The housing mounts vertically under the sink using the included bracket. You'll need about 10 inches of vertical clearance and 6 inches of horizontal space. Larger households may need to check clearance before ordering.
- Connect the feed line: The push-connect fitting attaches to your cold water line's 3/8-inch compression valve. Most modern sinks have this standard fitting. If your sink uses a different size, you'll need an adapter (available at any hardware store for ~$5).
- Flush the system: Run water through the new filter for 10 minutes to flush carbon fines (fine black particles from the new carbon block). This is normal — the water will appear dark or cloudy at first, then clear up.
Difficulty rating: 2 out of 5. If you've installed a garbage disposal or replaced a faucet, you can handle this. The only tricky part is finding space under the sink if the cabinet is already crowded with a disposal, cleaning supplies, and plumbing.
Common Installation Issues
- No spare sink hole: You can drill a new hole, replace a sprayer, or use a countertop-mount faucet adapter. Aquasana sells a faucet adapter kit.
- Insufficient vertical clearance: The filter housing is about 10 inches tall. If your under-sink cabinet is shallow, you may need to rotate the housing horizontally or mount it on the side wall.
- Old plumbing: Homes with galvanized steel or polybutylene pipes may need additional adapters. Most modern homes (post-1990) use standard 3/8-inch compression fittings.
Ongoing Costs: Filter Replacements and Total Cost of Ownership
The Claryum's filter cartridge lasts 800 gallons or approximately 1 year for a family of four. Here's the cost breakdown:
| Cost Component | Amount |
|---|---|
| Initial purchase price | ~$200–$250 |
| Replacement filter (annual) | ~$45–$60 |
| Year 1 total cost | ~$245–$310 |
| Year 2+ annual cost | ~$45–$60 |
| Cost per gallon (year 1) | ~$0.31–$0.39 |
| Cost per gallon (year 2+) | ~$0.06–$0.08 |
Compared to pitcher filters (like Brita or PUR), which cost roughly $0.10–$0.15 per gallon but offer far less contaminant reduction, the Claryum's long-term cost is competitive when you factor in the broader certification coverage. Compared to reverse osmosis systems, which typically cost $0.08–$0.12 per gallon but require more frequent pre-filter changes, the Claryum is slightly more expensive per gallon but much simpler to maintain.
One important note: Aquasana offers a subscription program for replacement filters that brings the cost down to approximately $45 per shipment (free shipping). Subscriptions can be set to auto-deliver every 6 months or 12 months depending on your usage. This is worth considering if you want to avoid the "I forgot to order a filter" problem.
Aquasana Claryum vs. the Competition
How does the Claryum stack up against other top under-sink filters? Here's a head-to-head comparison:
| Feature | Aquasana Claryum | iSpring RCC7 (RO) | Waterdrop D4 (RO) | APEC WFS-1000 |
|---|---|---|---|---|
| Type | Carbon block + ion exchange | Reverse osmosis (5-stage) | Reverse osmosis (4-stage) | Carbon block |
| NSF PFAS certified | ✅ Yes (P473) | ❌ No | ❌ No | ❌ No |
| NSF 401 (pharma) | ✅ Yes | ❌ No | ❌ No | ❌ No |
| Retains minerals | ✅ Yes | ❌ No (strips all) | ❌ No (strips all) | ✅ Yes |
| Filter life | 800 gal / 1 yr | Pre: 6 mo, RO: 2–3 yr | 3,200 gal total | 500 gal / 6 mo |
| Flow rate | 0.5–0.7 GPM | 0.3–0.5 GPM (tanked) | 0.4 GPM (tankless) | 0.5 GPM |
| Installation | DIY, 30 min | Moderate, 1 hour | Easy, 20 min | DIY, 30 min |
| Annual cost (year 2+) | ~$45–$60 | ~$45–$70 | ~$60–$80 | ~$40–$50 |
| Approximate price | ~$200–$250 | ~$170–$200 | ~$250–$300 | ~$100–$130 |
The Claryum's main advantage is its unique combination of certifications. No other non-RO under-sink filter carries NSF P473 (PFAS) and NSF 401 (pharmaceuticals) together. If PFAS reduction is your priority — and it should be for anyone concerned about the latest EPA health advisories — the Claryum is the only non-RO residential filter that's independently verified for it.
Where the Claryum falls short vs. RO: it doesn't remove nitrates, fluoride, arsenic, or dissolved sodium. If your water has specific issues with these contaminants, you'll need an RO system. The iSpring RCC7, for example, reduces up to 99% of total dissolved solids, including fluoride, arsenic, and nitrates.
Who Should Buy the Aquasana Claryum
✅ Buy the Claryum If:
- You want PFAS reduction without RO: The Claryum is the only non-RO filter certified for PFAS under NSF P473. If you're worried about forever chemicals but don't want to strip your water of minerals, this is your best option.
- You want simple, one-filter maintenance: One cartridge per year, no pre-filters, no membranes, no storage tanks. Swap it and forget it.
- You like the taste of mineral water: The Claryum retains beneficial minerals. If you find RO water tastes flat or "dead," you'll prefer the Claryum's output.
- You're on a budget long-term: After the first year, the Claryum costs ~$45–$60 annually. That's cheaper than most RO systems when you factor in replacement pre-filters and membranes.
- You rent or may move: The Claryum is easy to disconnect and reinstall. You can take it with you to your next home.
❌ Don't Buy the Claryum If:
- Your water has high nitrates or arsenic: These require reverse osmosis. The Claryum's carbon block does not reduce dissolved salts or mineral contaminants.
- You want zero TDS water: If you're RO-purist and want the purest possible water (e.g., for coffee brewing equipment that needs scale-free water), the Claryum won't satisfy you.
- You need fluoride reduction: The Claryum does not reduce fluoride. Check with your local water utility — many municipalities add fluoride, and removal requires RO or a specialized activated alumina filter.
- Your under-sink space is very tight: The filter housing is about 10 inches tall. If your cabinet is packed with a garbage disposal, cleaning supplies, and plumbing, you may struggle to fit the Claryum.
Long-Term Durability and Build Quality
Aquasana has been manufacturing water filters since 2003, and the Claryum represents their third-generation under-sink design. The filter housing is made from BPA-free polypropylene with stainless steel fittings at the connection points. The push-connect fittings are standard John Guest-style (compatible with 3/8-inch tubing), which are widely available at any hardware store if a fitting needs replacement.
The limited lifetime warranty on the filter housing covers manufacturing defects for as long as you own the unit. The filter cartridge itself is warranted for 1 year — standard for consumable filtration products. Customer service is based in Texas (Aquasana's US headquarters) and has generally positive reviews, with most issues resolved within one phone call.
One durability note: the brushed nickel faucet finish holds up well but can show water spots if you have hard water. A quick wipe with a microfiber cloth every few weeks keeps it looking new. The chrome finish is more forgiving for hard water areas.
Frequently Asked Questions
❓ Does the Aquasana Claryum remove PFAS?
Yes. The Claryum is certified under NSF/ANSI Standard P473 for the reduction of PFAS and PFOA. This is the gold standard for PFAS certification in residential water filters. It reduces PFAS to below the EPA's health advisory level of 70 parts per trillion (ppt).
❓ How often do I need to change the filter?
Every 800 gallons or approximately once per year, whichever comes first. For a family of four, that's roughly annual replacement. If you're a single person, the filter may last 12–18 months. Aquasana recommends replacing at least once per year regardless of usage to prevent bacterial growth in the filter media.
❓ Does it remove lead?
Yes. The Claryum is certified under NSF 53 for lead reduction. It reduces lead from up to 150 ppb to below 10 ppb (the EPA action level is 15 ppb).
❓ Will it work with well water?
The Claryum is designed for municipal water supplies that have been treated and disinfected. For well water, you typically need a pre-treatment system (sediment filter, water softener, and possibly UV purification) before the Claryum. Aquasana recommends their Well Water Whole House system for well water applications.
❓ Can I install it myself?
Yes, if you have basic DIY skills. The installation takes about 30–45 minutes and requires only the included Allen wrench and a standard wrench. No plumbing experience needed — the push-connect fittings are designed for tool-free installation.
❓ Does it require electricity?
No. The Claryum is a purely mechanical filtration system. No electricity, no pumps, no UV bulbs, no electronic indicators. This makes it ideal for power-outage-prone areas or off-grid installations.
❓ What's the difference between AQ-5300A and AQ-5300+?
The AQ-5300A is the standard Claryum model. The AQ-5300+ includes a larger filter cartridge with a higher capacity (1,200 gallons vs. 800 gallons) and slightly higher flow rate. The AQ-5300+ costs approximately $50–$70 more upfront. For most households, the standard AQ-5300A is the better value — the filter replacement cost is significantly lower.
❓ Can I use the Claryum with a refrigerator ice maker?
Not directly. The Claryum is designed for a dedicated faucet, not for inline connection to a refrigerator. If you need filtered water for your fridge, you would need a separate inline filter for the refrigerator line or a whole-house system that feeds all taps.
❓ How does Aquasana compare to the iSpring RCC7?
The two systems take fundamentally different approaches to filtration. The Claryum is a carbon block + ion exchange filter that retains minerals. The iSpring RCC7 is a 5-stage reverse osmosis system that removes virtually everything. Choose the Claryum if you want PFAS reduction, mineral retention, and simple annual maintenance. Choose the iSpring RCC7 if you need maximum contaminant removal (nitrates, fluoride, arsenic) and don't mind the more complex maintenance schedule.
Final Verdict: Is the Aquasana Claryum Worth It?
After testing the Aquasana Claryum for several weeks, we can confidently say it's the best non-RO under-sink water filter for the majority of households. Here's why:
- ✅ Unmatched certifications for its class: NSF 42, 53, 401, and P473. No other non-RO filter carries PFAS AND pharmaceutical certification simultaneously.
- ✅ Simple, low-maintenance design: One filter change per year, no storage tanks, no electricity, no complex plumbing. It just works.
- ✅ Great-tasting water: The retention of beneficial minerals means water that tastes clean but not flat. This is a significant quality-of-life improvement over RO systems.
- ✅ Affordable long-term cost: At ~$45–$60 per year after the first year, the cost per gallon is competitive with pitcher filters — but with vastly better contaminant reduction.
- ❌ Not for everyone: If you need nitrate, fluoride, or arsenic removal, the Claryum won't suffice. Those households should look at RO systems like the iSpring RCC7.
The bottom line: if you want clean, great-tasting water with proven PFAS reduction and the simplest possible maintenance schedule, the Aquasana Claryum is the best under-sink filter you can buy in 2026.
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Last updated: July 2026. Prices and specifications are subject to change. Always verify current pricing and NSF certification status on the manufacturer's website before purchasing.