Hey! So, you're curious about whether the Waterpik Aquarius WP-660 has mold issues.
Based on what we've found, mold isn't typically flagged as a big concern with this model. Of course, since it involves water, it's smart to be careful and keep things clean, as stagnant water can lead to mold or mildew over time.
Just like other water flossers, regular cleaning and maintenance are your best bets to avoid any mold trouble.
A good tip to keep your Waterpik Aquarius WP-660 mold-free is to empty the water reservoir after each use and let it air dry. Also, once in a while, wash the reservoir with mild soap and warm water.
For the inner workings, you can run a mix of water and white vinegar—or a descaling solution—through it. This helps prevent mineral deposits or mold from forming.
According to the manufacturer's description, maintaining it isn't too tricky. It’s designed for user convenience, so following basic upkeep steps should keep it in good shape.
And even though many folks don’t talk about mold, feedback we've gathered suggests that staying on top of maintenance is vital for keeping it clean.
So, if you give it a bit of TLC with these maintenance tips, your Waterpik Aquarius WP-660 should be mold-free and ready for action.
But if you ever notice any mold anyway, you could look into more in-depth maintenance tips for water flossers or reach out to Waterpik's customer support for help.
Hope this helps! If you've got more questions or need any other info, feel free to ask.
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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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