Waterpik Aquarius WP-660 Review: Would Owners Buy It Again?
Disclosure: As an Amazon Associate I earn from qualifying purchases. If you buy through links on this page we may earn a commission at no extra cost to you. How this review was made: We did not test this water flosser in person. This verdict is based on our analysis of Reddit discussions, expert reviews and owner reports, all listed at the end of this article. Our method.
Effective and well-loved, but register that warranty
The Aquarius is the water flosser Reddit mentions most, and dentists often recommend it by name. Owners like the 10 pressure levels and big tank. The catch is reliability: some owners report leaks from the handle or base within months, and one says theirs stopped working reliably after 16 months. The 3-year warranty helps a lot, so keep your receipt.
Check current price on Amazon → Prices and availability change often, so we don't list them here.Buy it again if you…
- want a countertop flosser with lots of pressure control
- have braces, implants or bridges (it includes specialty tips)
- don't mind a corded unit on the bathroom counter
- will register the 3-year warranty
Skip it if you…
- have very little counter space
- want something quiet for early mornings
- want a cordless unit for travel
This review summarizes user experiences and is not dental or medical advice. Ask your dentist whether a water flosser is right for you.
The Waterpik Aquarius WP-660 is a countertop water flosser with a 22 oz tank, 10 pressure settings, a massage mode and seven different tips. It's been sold for years, so there's lots of owner feedback.
What owners say, at a glance
Bars show our editorial summary of how consistently owners praise or complain about each area across all sources — not a lab measurement.
The key specs
| Tank | 22 oz (651 ml) |
|---|---|
| Pressure | 10 settings, about 10–100 PSI |
| Modes | Floss and Massage |
| Tips included | 7, including orthodontic, plaque-seeker and pik-pocket tips |
| Timer | 1 minute, with a 30-second pacer |
| Warranty | 3 years |
What owners love
What owners complain about
How it holds up after months of use
This is why we give it a Depends rather than a Repeat. Plenty of owners use theirs for years, but leak reports are frequent enough that some Reddit users switched to cordless models or simpler designs. The 3-year warranty is the safety net. Waterpik also sells replacement parts, and many leaks come from a tip or handle that isn't fully seated.
Tips from owners
- Make sure the tip clicks into place. A loose tip is a common cause of leaks.
- Start on setting 1–3 and increase over a few weeks.
- Run a vinegar-and-water cycle now and then to clear mineral buildup.
- Replace tips every 3–6 months.
- Register the product so the 3-year warranty is easy to use.
Pros and cons
What owners love
- Most-recommended water flosser among Reddit users
- 10 pressure settings and 7 tips
- Large 22 oz tank
- Built-in timer and pacer
- 3-year warranty
What owners complain about
- Leak reports within months for some owners
- Loud at higher settings
- Corded and takes up counter space
- Replacement tips are an ongoing cost
Other options owners compare
Owners who switched away usually went for one of these.
| Model | Type | Consider it if… | |
|---|---|---|---|
| Waterpik Aquarius WP-660 (this review) | Countertop | You want maximum pressure control at home | See on Amazon |
| Philips Sonicare Power Flosser 3000 | Cordless | You want cordless and easier to store | See on Amazon |
| Waterpik Cordless Advanced | Cordless | You want Waterpik but portable and quieter | See on Amazon |
Want the water flosser dentists recommend most?
Check the current price and colors on Amazon.
Frequently asked questions
Why is my Waterpik leaking?
The most common cause is a tip that isn't fully clicked in. If it leaks from the base or handle, contact Waterpik, since the WP-660 has a 3-year warranty.
What pressure setting should I use?
Start low (1–3) and build up. Many owners find a middle setting is enough.
How loud is it?
Electric Teeth measured 72 dB at maximum pressure.
How long does a Waterpik last?
Many owners use theirs for years, but some report leaks within months. The 3-year warranty covers defects.
Sources we analyzed
- RedditConsumer: best water flosser 2026 — Reddit praise, leak reports and alternatives
- Electric Teeth: Aquarius WP-660 review — specs, noise and warranty
- Electric Teeth: Waterpik troubleshooting — leak causes and fixes
- Reviewed: Waterpik Aquarius review — hands-on experience
- ShopSavvy: WP-660 review summary — recurring customer concerns
Figures reflect each source as of September 29, 2026 and may change. We summarize owner feedback in our own words and do not reproduce retailer reviews.