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Head-to-head · Best Under-Sink Water Filters

Aquasana Claryum AQ-5300+ vs Frizzlife MP99

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Aquasana Claryum AQ-5300+ comes out ahead by a narrow margin (4.6 vs 4.4). The gap is mostly about Households that want broad, certified contaminant reduction and great taste from a no-wait under-sink filter, while keeping healthy minerals. — read the strengths below before deciding.

Aquasana Claryum AQ-5300+
Higher ratedRanked #1 in Best Under-Sink Water Filters
Aquasana Claryum AQ-5300+
$191.24as of Jun 7

The Aquasana Claryum AQ-5300+ is the best all-around under-sink carbon filter, pairing NSF/ANSI 42, 53 and 401 certification with a fast-flow three-stage design that keeps healthy minerals in the water. It reduces 99% of 77 contaminants, including lead, chlorine, PFAS and pharmaceuticals, without the water waste of reverse osmosis. The trade-off is a 6-month filter life and a higher per-gallon cost, but for clean, great-tasting water it's the top pick.

Strengths
  • — Triple-stage Claryum filtration reduces 99% of 77 contaminants including lead, chlorine, PFAS and pharmaceuticals
  • — NSF/ANSI 42, 53 and 401 certified, covering taste, health contaminants and emerging compounds
  • — Retains beneficial minerals like calcium and magnesium rather than stripping them
Watch-outs
  • — Filters last about 6 months or 800 gallons, shorter than some rivals
  • — Per-gallon filter cost is higher than basic single-cartridge systems
  • — Requires a spare faucet hole or drilling for the dedicated faucet
$191.24 · Check Price on AmazonFull review →
Frizzlife MP99
Ranked #4 in Best Under-Sink Water Filters
Frizzlife MP99
$80as of Jun 8

The Frizzlife MP99 is a compact, affordable two-stage under-sink filter with a clever twist-change cartridge and a strong 1.4 GPM dedicated faucet. Tested to NSF/ANSI 42/53, its 0.5-micron media reduces lead, chlorine and 70-80 VOCs while keeping beneficial minerals, and the auto shut-off valve means no need to cut the water supply at filter-change time. It's a tidy, low-cost choice for essential filtration with an easy maintenance routine.

Strengths
  • — Two-stage 0.5-micron filtration reduces lead, chlorine and 70-80 VOCs
  • — Tested to NSF/ANSI 42/53 by IAPMO R&T
  • — Auto shut-off valve lets you twist-change the cartridge without shutting off water
Watch-outs
  • — Shorter filter life than long-life cartridges like the Waterdrop 15UA
  • — Two-stage design has less breadth than three-stage systems
  • — Requires a hole for the dedicated faucet
$80 · Buy at frizzlife.comFull review →

How they stack up

Aquasana Claryum AQ-5300+

More certified contaminant coverage than the Waterdrop 15UA and Filtrete 3US-PS01, and faster flow than the Frizzlife MP99. Unlike the Clearly Filtered 3-Stage, the AQ-5300+ carries multiple NSF certifications rather than relying on third-party testing alone.

Frizzlife MP99

A lower-cost alternative to the Aquasana Claryum AQ-5300+ and Clearly Filtered 3-Stage, with a dedicated faucet the Waterdrop 15UA and Filtrete 3US-PS01 lack. Its twist-change cartridge is more convenient than the Filtrete but its filter life is shorter than the Waterdrop 15UA.

Specs side-by-side

SpecAquasana Claryum AQ-5300+Frizzlife MP99
Filtration3-stage Claryum2-stage compound, 0.5 micron
CertificationsNSF/ANSI 42, 53, 401NSF/ANSI 42/53 (IAPMO tested)
Contaminants Reduced99% of 77 (lead, chlorine, PFAS, pharmaceuticals)Lead, mercury, chlorine, 70-80 VOCs
Filter Life6 months / 800 gallons—
Mineral RetentionYes (calcium, magnesium)Yes
FaucetDedicated brushed nickel includedDedicated brushed nickel included
Install Time~30-45 min DIY—
FlowMax Flow (no tank)—
Flow Rate—1.4 GPM @ 60 psi
Maintenance—Twist-change with auto shut-off
Replacement Filter—FZ-2 cartridge
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