In-depth review
Waterpik Aquarius WP-660 Review (2026)
In-depth review of the Waterpik Aquarius: ten pressures, seven tips, reservoir, noise, and why it remains the countertop benchmark.
Waterpik Aquarius WP-660
The countertop benchmark with 10 settings and 7 tips.
Our verdict
The Aquarius is the safe, complete countertop buy: the widest pressure ladder at its price, tips for nearly every mouth in the house, and a tank that finishes the job. Its costs are counter space and motor noise. Buy it as the household flosser; look cordless only if space or travel truly demands it.
What we like
- Ten pressure settings from a gentle 10 PSI class low end to a deep-cleaning maximum, plus Floss and Massage modes, cover first-time sensitive gums and stubborn plaque around braces in one machine.
- The 22 oz reservoir delivers over 90 seconds of flossing, so a full mouth finishes on one fill, and the 360-degree rotating handle reaches back molars without wrist gymnastics.
- Seven tips in the box (classic jets for the family, plus orthodontic, Pik Pocket, and Plaque Seeker tips) and ADA acceptance make it the reference countertop flosser dentists most often name.
What to watch out for
- It is a countertop appliance with a cord and a real footprint; small bathrooms feel it.
- The motor is audible through a bathroom door, a common complaint in early-morning households.
- Tips should be replaced every 3 to 6 months depending on type, an ongoing cost to plan for.
Who it is for
Households and braces or implant owners who want one proven countertop flosser with family tips included.
Pressure range and modes in practice
Ten settings is the Aquarius's core advantage. The low end is gentle enough for first-week users and post-procedure gums, the middle covers daily family flossing, and the top end flushes braces and bridgework convincingly. The separate Massage mode lowers the stream into a gum-stimulating pulse. Published expert reviews consistently credit this ladder, not headline power, for the model's longevity as the category reference.
Reservoir, handle, and tips
The 22 oz tank delivers over 90 seconds of continuous flossing, which in practice means one fill per thorough session. The handle rotates 360 degrees and carries an on-off water switch, so you can position before the spray starts, the detail beginners appreciate most. Seven tips cover classic jet use for up to four people plus orthodontic, pocket, and plaque specialties, and the lid stores spares hygienically.
Noise, footprint, and upkeep
The Aquarius is not quiet, and its corded base claims real counter territory. The reservoir lifts off for filling and washing, and Waterpik advises regular cleaning and descaling in hard-water homes. Owners who empty and air-dry the tank avoid the musty-tank complaints that trail this whole category in reviews.
How it stacks up
Against the Waterpik ION, the Aquarius gives up cordless placement and a smaller footprint but keeps the same class of pressure range and tips for less money; choose the ION for the counter, the Aquarius for the wallet. Against the Philips Power Flosser 5000, the Aquarius is louder and less elegant but includes far more tips and a wider single-jet pressure tradition. Families pick Waterpik; quiet gum-focused singles pick Philips.
What owners report
Commonly praised
- Ten pressure settings let owners ease in gently and build up slowly
- Full mouth finishes on one fill thanks to the generous reservoir
- Rotating handle reaches back molars without awkward wrist angles
Common complaints
- Corded base takes up real space on smaller bathroom counters
- Motor noise carries through the door during early morning use
- Ongoing tip replacements every few months add to the running cost
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
Key specifications
- Pressure settings
- 10 settings, Floss and Massage modes
- Reservoir
- 22 oz, 90+ seconds of flossing
- Tips included
- 7 (4 classic jet, orthodontic, Pik Pocket, Plaque Seeker in current packaging)
- Power
- Corded countertop
- Warranty
- 3-year limited per Waterpik
Also consider
Waterpik ION Professional WF-12
Full countertop performance with no cord during use.
- Pressure settings: 10 settings
- Reservoir: 20 oz, 90+ seconds of flossing
Philips Sonicare Power Flosser 5000
Quad Stream coverage and a quiet countertop design.
- Pressure settings: 2 modes (Clean, Deep Clean), 10 intensities
- Reservoir: 550 ml
Research-based assessment. ThePickLedger has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.
Questions, answered
How many people can share an Aquarius?
Several, with a personal tip each. The box includes multiple classic jet tips, and colour-coded replacement tips keep ownership obvious. The base and reservoir are shared; tips never are.
Is the Aquarius good for implants?
Yes. Use the Plaque Seeker tip on a low-to-mid setting around implant margins, a use case Waterpik designs that tip for. Confirm pressure with your implant dentist at recall visits.
What warranty does the Aquarius carry?
A 3-year limited manufacturer's warranty per Waterpik, among the longest in this guide. Keep the receipt and register the product for the smoothest support.