The Waterpik Aquarius WP-660 has a water reservoir that usually lasts around 90 seconds when you're flossing, depending on the pressure setting you choose. The manufacturer mentions that the reservoir should hold enough water for a thorough session without having to refill it too often.
If you prefer to go slower and use a lower pressure, you might get a bit more time out of it. From what we found, some people who enjoy a longer cleaning session sometimes refill the reservoir to fit their routine.
One of its nice features is how easy it is to refill. So even if you do run out of water mid-session, topping it off is a breeze. According to our research, folks appreciate this ease, especially when they're getting into a regular oral hygiene regimen with the flosser.
Overall, the WP-660 does a great job balancing water capacity and power, giving you the flexibility to adjust to your needs while keeping things straightforward.
It's been noted for its effectiveness in boosting dental care, particularly for those with braces or anyone wanting to step up their flossing game. Plus, with its adjustable settings, it fits nicely into different personal care routines.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Jun 20, 2026.
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