Aquasana AQ-5300 Review: Is This 3-Stage Under-Sink Filter Worth It?

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Aquasana AQ-5300+ Review

Quick Verdict

★★★★½ 4.5/5 (2,847 reviews)

The Aquasana AQ-5300+ is an excellent mid-range under-sink filter that removes 99% of 77 contaminants including lead, chlorine, PFAS, and pharmaceuticals. At $150-180, it hits the sweet spot between budget carbon filters and premium reverse osmosis systems. Installation takes 30-45 minutes for most DIYers, and the triple-stage Claryum filtration delivers noticeably cleaner-tasting water from day one.

• Filtration Stages: 3 (Claryum)
• Contaminants Removed: 77+
• Flow Rate: 0.72 GPM
• Filter Life: 6 months / 800 gal
• Certifications: NSF 42, 53, 401, 473
• Warranty: 1 year

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Best for: Homeowners on municipal water who want comprehensive contaminant removal without the complexity, waste water, or mineral stripping of reverse osmosis systems. Not ideal if you need fluoride removal or have severely contaminated well water.

How the 3-Stage Claryum Filtration Works

The AQ-5300+ uses Aquasana's proprietary Claryum filtration technology across three distinct stages:

1. Pre-filter: Removes sediment and larger particles down to 20 microns, protecting the downstream filters and extending their life.
2. Activated carbon block: The workhorse stage. Removes chlorine, chloramines, VOCs, herbicides, pesticides, and organic chemicals through adsorption. This is what eliminates the chemical taste and odor from municipal water.
3. Ion exchange + sub-micron filtration: Targets heavy metals (lead, mercury) and microscopic contaminants. The ion exchange process selectively removes lead while leaving beneficial minerals like calcium and magnesium in your water.

This combination is more thorough than single-stage carbon filters but less aggressive than reverse osmosis systems. The key advantage: RO systems strip everything from your water (including minerals) and waste 3-4 gallons for every gallon filtered. The AQ-5300 produces zero waste water and keeps the minerals your body needs.

Full Technical Specifications

Key contaminants removed: chlorine, chloramines, lead, mercury, asbestos, VOCs (benzene, styrene), PFOA/PFOS, herbicides, pesticides, pharmaceuticals (ibuprofen, estrone, naproxen).

Installation: What to Expect

Difficulty: Moderate (6/10)

If you've ever replaced a faucet or done basic plumbing, you can install the AQ-5300 yourself in 30-45 minutes. The kit includes the filter housing and cartridges, a dedicated filtered water faucet, mounting bracket, tubing, fittings, installation wrench, and detailed instructions.

What you'll need: Adjustable wrench, screwdriver, drill with 1.25" bit (for faucet hole if needed), bucket and towels.

Installation steps:

1. Turn off cold water supply under sink
2. Drill hole in sink or countertop for dedicated faucet (or use existing soap dispenser hole)
3. Mount filter housing to cabinet wall
4. Connect inlet tubing to cold water line
5. Connect outlet tubing to dedicated faucet
6. Flush system for 5 minutes before first use

The trickiest part is drilling the faucet hole if you don't have an existing extra hole. If you're not comfortable drilling through granite or quartz, hire a plumber for that step ($100-150). The push-to-connect fittings are a nice touch - no compression fittings or Teflon tape needed.

Filter Replacement: Ongoing Costs

Filters need replacing every 6 months or 800 gallons, whichever comes first. For a family of 4 using filtered water for drinking and cooking, plan on twice per year.

We recommend sticking with OEM filters to maintain NSF certification and warranty coverage. The replacement process takes about 5 minutes: turn off water, twist off old cartridges, twist on new ones, flush for 5 minutes. No tools required.

Contaminant Removal Performance

Based on NSF/ANSI certifications (standards 42, 53, 401, and 473), the AQ-5300 removes:

• 99%+ of lead (tested up to 150x EPA limit)
• 97% of chlorine (major improvement in taste and odor)
• 96% of PFAS (PFOA/PFOS "forever chemicals") - see our complete PFAS filter guide
• 99% of asbestos
• 95%+ of VOCs (benzene, styrene, trichloroethylene)
• 99% of pharmaceuticals (ibuprofen, estrone, naproxen)
• Chloramines (disinfectant byproduct increasingly used by municipalities)

What it does NOT remove: fluoride (requires separate add-on or RO), total dissolved solids, bacteria/viruses (not designed as a purifier). It intentionally retains beneficial minerals like calcium and magnesium.

Taste improvement: If you're on municipal water with heavy chlorine or chloramine treatment, the difference is immediate and significant. Water tastes clean and neutral with no chemical aftertaste.

Aquasana AQ-5300 vs AQ-4000: Which One?

Aquasana's AQ-4000 is their countertop alternative. Here's how they compare:

Bottom line: The AQ-4000 works if you're renting, on a tight budget, or don't want to drill holes. But the AQ-5300 delivers better filtration, faster flow, longer filter life per gallon, and keeps your counter clear. If you own your home, the AQ-5300 is the better long-term investment.

Who Should Buy the Aquasana AQ-5300?

Ideal for:

• Homeowners on municipal water who want comprehensive contaminant removal
• Families concerned about lead, chlorine, and PFAS exposure
• People who find RO systems too complex, wasteful, or mineral-stripping
• DIYers comfortable with basic plumbing
• Anyone who wants filtered water without counter clutter

Look elsewhere if:

• You're renting (go with the AQ-4000 countertop model instead)
• You need fluoride removal (requires add-on filter or full RO system)
• You have well water with severe contamination (consider a whole-house system or dedicated well water filter)
• You're on an extremely tight budget (ongoing filter costs add up to ~$150/year)

Final Verdict: 4.5/5 Stars

The Aquasana AQ-5300+ is a solid mid-range under-sink filter that delivers what it promises. It occupies a practical middle ground between cheap pitcher filters and expensive RO systems. For most homeowners on municipal water who want clean, great-tasting water without complexity, this is an excellent choice.

Installation is straightforward for DIYers, maintenance is simple (5-minute filter swaps twice a year), and the water quality improvement is noticeable immediately. The $150-160 annual filter cost is reasonable compared to buying bottled water or maintaining an RO system. Over five years, you're looking at roughly $900 total (system + filters), which works out to about $15/month for unlimited filtered drinking and cooking water.

If fluoride removal is critical for you, factor in the cost of the add-on fluoride filter or consider an RO system. Otherwise, the AQ-5300 hits the sweet spot for most households.