Head-to-head · Best Water Flossers

Waterpik Aquarius WP-660 vs Waterpik ION Professional (WF-12)

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

Waterpik ION Professional (WF-12) comes out ahead by a narrow margin (4.6 vs 4.7). The gap is mostly about buyers who want countertop-level power and capacity without a cord, and do not mind recharging every few weeks — read the strengths below before deciding.

Ranked #2 in Best Water Flossers

Waterpik Aquarius WP-660

4.6

$99.99as of Jun 7

The Waterpik Aquarius WP-660 is the countertop water flosser reviewers treat as the benchmark. Ten pressure settings, a big 22 oz reservoir for 90-plus seconds of flossing, seven tips, and two modes make it the most complete and most clinically recommended irrigator you can buy. MedGrade scores it 92/100 and calls it the industry standard. It is loud at high pressure and takes counter space, but for daily home use nothing has a stronger track record.

Strengths

— 10 pressure settings (10-100 PSI) cover sensitive gums to aggressive plaque removal
— Large 22 oz reservoir delivers 90+ seconds of flossing per fill
— Seven included tips cover braces, implants, plaque, and multiple users

Watch-outs

— Motor and stream are noticeably loud at high pressure
— Countertop footprint takes more space than a cordless unit
— Reservoir can develop mold if not dried between uses

$99.99 · Check Price on Amazon Full review →

Higher ratedRanked #1 in Best Water Flossers

Waterpik ION Professional (WF-12)

4.7

$79.99as of Jun 7

The Waterpik ION Professional WF-12 is essentially the Aquarius's performance in a cordless body: it keeps the full 10-100 PSI pressure range, a large reservoir for 90-plus seconds of flossing, and seven tips, but runs on a rechargeable battery that lasts up to four weeks per charge. MedGrade scored it the highest of any flosser at 94/100. It costs more than the Aquarius and the battery may fade over time, but it is the best pick for full power without a cord.

Strengths

— Full countertop power in a cordless body - 10 settings and a 22 oz-class reservoir
— Maintains the 10-100 PSI range and 1,300-1,400 pulses per minute of a corded unit
— Rechargeable lithium-ion battery lasts up to 4 weeks per charge

Watch-outs

— Premium price for a cordless unit
— Some owners report battery life shortening after 8-12 months
— Taller, top-heavy design versus a handheld travel flosser

$79.99 · Check Price on Amazon Full review →

How they stack up

Waterpik Aquarius WP-660

The countertop benchmark - it offers the same 10 pressure settings and 22 oz reservoir as the cordless Waterpik ION Professional WF-12 but plugs in for unlimited run time, beats the budget AquaSonic Aqua Flosser on power and tip selection, and unlike the cordless Waterpik Cordless Advanced 2.0 WP-580 or the Philips Sonicare Power Flosser 3000 it never needs recharging.

Waterpik ION Professional (WF-12)

The cordless equivalent of the Waterpik Aquarius WP-660 - it keeps the full 10-setting pressure range and large reservoir but runs on a battery, so it beats the small-tank Waterpik Cordless Advanced 2.0 WP-580 and the 3-setting Philips Sonicare Power Flosser 3000 on capacity and power, and outclasses the budget AquaSonic Aqua Flosser, at the cost of occasional recharging the corded Aquarius never needs.

Specs side-by-side

Spec	Waterpik Aquarius WP-660	Waterpik ION Professional (WF-12)
Type	Countertop (corded)	Cordless countertop
Pressure Settings	10 (10-100 PSI)	10 (10-100 PSI)
Reservoir	22 oz (90+ sec)	20-22 oz (90+ sec)
Tips Included	7	7
Modes	Floss + Hydro-Pulse Massage	—
Pulses	1,400 per minute	1,300-1,400 per minute
Timer	1-min timer + 30-sec pacer	—
Warranty	3-year limited	3-year limited
Battery	—	Lithium-ion, up to 4 weeks/charge
Flow Rate	—	13 oz/min

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