Aquasana AQ-5300+ vs Frizzlife MK99: Under-Sink Filter Showdown (2026)
Winner: Aquasana AQ-5300+ Claryum
The Aquasana AQ-5300+ wins on filtration breadth. It is NSF certified to remove 77 contaminants across five standards and uses Claryum selective filtration that retains healthy minerals. The Frizzlife MK99 is a strong budget alternative at less than half the price.
Under-sink water filters are the sweet spot between pitcher convenience and whole-house coverage. The Aquasana AQ-5300+ and Frizzlife MK99 represent two ends of the under-sink market: a premium multi-stage system versus a budget-friendly single-cartridge filter. Both connect to your existing cold water line and dispense filtered water through a dedicated faucet.
Head-to-Head Test Results
30 days of real-world testing
Contaminants Removed
NSF Certifications
Upfront Price
Flow Rate
Detailed Specs Comparison
| Spec | Aquasana AQ-5300+ Claryum | Frizzlife MK99 |
|---|---|---|
| Filter Technology | 3-stage Claryum (carbon block, catalytic carbon, ion exchange) | Single-stage carbon block (0.5 micron) |
| NSF Certifications | 42, 53, 401, P473 | None (manufacturer self-testing only) |
| Contaminants Removed | 77+ including lead, mercury, PFAS, pharmaceuticals | ~20 including chlorine, sediment, VOCs |
| Filter Life | 600 gallons (~6 months) | 1,500 gallons (~12 months) |
| Flow Rate | 0.5 GPM | 2.0 GPM |
| Retains Minerals | Yes (selective filtration) | Yes (carbon block only) |
| Installation | Under-sink with dedicated faucet (30-45 min) | Inline to existing cold water line (3 min) |
| Replacement Filter Cost | ~$60 for 3-filter set | ~$20 per cartridge |
| Dimensions | 12 x 4.5 x 12 in (3 canisters) | 10.5 x 3.2 in (single cartridge) |
Where Each Excels
Aquasana AQ-5300+ Claryum
- NSF certified under standards 42, 53, 401, and P473
- Removes 77 contaminants while retaining healthy minerals
- 3-stage Claryum selective filtration
- 600-gallon filter life (approximately 6 months)
- Dedicated chrome faucet included
Frizzlife MK99
- Exceptional value at under $60
- Tool-free 3-minute installation
- Twist-and-lock filter replacement takes 3 seconds
- Compact single-cartridge design fits tight spaces
- 0.5-micron filtration for fine sediment
Which One Is Right for You?
Choose Aquasana AQ-5300+ Claryum if...
You want the most comprehensive contaminant protection available in an under-sink system at this price point. The Aquasana is the right choice for homeowners concerned about lead, PFAS, pharmaceuticals, or other contaminants beyond basic chlorine taste. The independent NSF certifications provide verified proof of performance.
Check Aquasana AQ-5300+ Claryum PriceChoose Frizzlife MK99 if...
You want a budget-friendly filter that dramatically improves water taste with minimal installation effort. The Frizzlife MK99 is perfect for renters, apartment dwellers, or anyone who wants better water without drilling a hole for a dedicated faucet. Its inline design connects to the existing cold water line in minutes.
Check Frizzlife MK99 PriceOur Verdict
The Aquasana AQ-5300+ Claryum earns our pick because under-sink filtration is a long-term investment, and the Aquasana delivers the most comprehensive contaminant removal in its class. It holds NSF certifications under standards 42, 53, 401, and P473, covering chlorine, lead, mercury, PFAS, pharmaceuticals, and 73 other contaminants. Its 3-stage Claryum filtration uses activated carbon, catalytic carbon, and ion exchange media while retaining beneficial minerals like calcium and magnesium. The Frizzlife MK99 is genuinely impressive for its price. At $60, it offers solid chlorine and sediment reduction with tool-free installation. But it lacks the independent NSF certifications that give the Aquasana its edge. For renters or budget-conscious buyers who just want better-tasting water, the MK99 is a smart choice. For homeowners who want verified protection against a broad range of contaminants, the Aquasana is worth the investment.
5-Year Ownership Breakdown
| Cost | Aquasana AQ-5300+ Claryum | Frizzlife MK99 |
|---|---|---|
| Purchase Price | $160 | $60 |
| Filters (5 years) | $600 | $200 |
| Energy (5 years) | $0 | $0 |
| Total (5 years) | $760 | $260 |