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

Aquasana Claryum AQ-5300+ vs iSpring RCC7AK

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+ and iSpring RCC7AK score essentially the same (4.7 vs 4.7). Pick the one whose trade-offs match your priorities — the strengths and watch-outs below are where they actually differ.

Ranked #1 in Best Under-Sink Water Filters

Aquasana Claryum AQ-5300+

4.7

$260

The Claryum is the best-overall non-RO pick — Aquasana's flagship removes 77 contaminants without RO water waste.

Strengths

— Removes 99% of 77 contaminants including lead, mercury, PFAS
— No water waste (not RO)
— Environmental-friendly cartridge design

Watch-outs

— Doesn't remove fluoride / arsenic (RO does)
— Higher upfront than basic filters
— Cartridge replacement every 6 months

$260 · Check Price on Amazon Full review →

Ranked #2 in Best Under-Sink Water Filters

iSpring RCC7AK

4.7

$240

The RCC7AK is the best-overall RO pick — iSpring's 6-stage with alkaline remineralization removes more contaminants than non-RO competitors.

Strengths

— Removes 99%+ contaminants including PFAS, lead, fluoride, arsenic
— Alkaline remineralization adds minerals back
— 6-stage filtration

Watch-outs

— Wastes ~3 gallons per gallon produced (RO design)
— Tank takes under-sink space
— Annual filter replacements

$240 · Check Price on Amazon Full review →

How they stack up

Aquasana Claryum AQ-5300+

Best non-RO. No water waste. Lead + mercury removal.

iSpring RCC7AK

Best RO. Adds minerals back. Wastes water.

Specs side-by-side

Spec	Aquasana Claryum AQ-5300+	iSpring RCC7AK
Type	Non-RO multi-stage	6-stage RO
Contaminants	77 removed	—
Waste	None	—
Cartridge	6-month	—
Stages	—	6 (with alkaline)
Cert	—	NSF
Daily Output	—	75 GPD

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