Waterpik Aquarius vs Select 5100: Which Countertop Water Flosser Fits Your Routine?

Quick answer

Choose the Waterpik Aquarius Professional (WP-670) if you want the most advanced countertop model with clinically proven gum health benefits and are willing to pay a bit more. Choose the Select 5100 (WF-28W010) if you want a quiet, waterproof countertop flosser that’s easier on the budget and still delivers effective cleaning.

Picking between two popular countertop water flossers can feel overwhelming, especially when both promise a cleaner mouth. The Waterpik Aquarius Professional (WP-670) and the Select 5100 (WF-28W010) are both solid countertop options, but they serve slightly different priorities. Here’s a direct comparison based on the specs that matter most: performance, convenience, and price.

We’ll walk through what each model offers, where they differ, and who should pick which. No fluff—just the facts to help you decide quickly.

Performance and Gum Health

The Aquarius Professional (WP-670) is marketed as the most advanced water flosser ever, with clinical evidence showing it can be up to 2X as effective for improving gum health compared to string floss. This makes it a strong choice if your main goal is addressing gum issues or you want the highest level of proven effectiveness.

The Select 5100 (WF-28W010) doesn’t carry the same clinical claim, but it still delivers effective water flossing. Its EasySpin 360-degree tip rotation helps you reach all areas of the mouth without awkward angles. If you’re looking for solid daily cleaning rather than a clinical upgrade, the Select 5100 holds its own.

• Consider the Aquarius if gum health is your top priority and you want the clinically backed advantage.
• The Select 5100’s rotating tip makes it easy to clean hard-to-reach spots, which is great for everyday use.

Design and Convenience

The Select 5100 is described as ultra-quiet and waterproof, making it a great fit for small bathrooms or even travel if you don’t mind a countertop unit. Its high-capacity rechargeable battery and travel mode add flexibility, though it’s still a countertop model, not a cordless one.

The Aquarius Professional doesn’t list waterproofing or travel mode in its specs, so it’s likely best kept in one place. If you need a flosser that can handle wet countertops or you want the option to move it around occasionally, the Select 5100’s design is more forgiving.

• If your bathroom is tight or you often splash water around, the Select 5100’s waterproof design is a practical advantage.
• The Aquarius is a stationary powerhouse—perfect for a dedicated spot on the counter.

Price and Value

Price is a clear differentiator. The Select 5100 is listed at USD 39.99 (compare at USD 79.99), while the Aquarius Professional costs USD 55.00 (compare at USD 109.99). That’s a USD 15 difference, which might be worth it if you want the advanced clinical benefits.

However, if you’re on a budget or just need a reliable flosser without the extra cost, the Select 5100 offers excellent value. It still comes with the features most people need—like tip rotation and quiet operation—at a lower price point.

• The Aquarius costs about 38% more than the Select 5100, so weigh that against the clinical advantage.
• For basic flossing needs, the Select 5100 gives you more savings without sacrificing core functionality.

The tradeoff: advanced clinical power vs. everyday convenience

• Gum health focus: The Aquarius Professional offers clinically proven up to 2X effectiveness for improving gum health vs. string floss. If you have gum concerns, this is a compelling reason to choose it. If gum health is your #1 priority, the Aquarius is the stronger pick.
• Design and portability: The Select 5100 is ultra-quiet, waterproof, and has travel mode—features that make it more adaptable to different bathrooms and lifestyles. The Aquarius doesn’t list these specs, so it’s less flexible. If you value quiet operation and water resistance, the Select 5100 wins.
• Budget: The Select 5100 costs USD 39.99 vs. USD 55.00 for the Aquarius. You save USD 15 with the Select, which could be used for replacement tips or other oral care products. If price is a deciding factor, the Select 5100 offers better value for most users.

Product facts at a glance

• White Aquarius Professional Water Flosser – White (WP-670): Aquarius Professional is the most advanced water flosser ever. Clinically proven up to 2X as effective for improving gum health vs. string floss. Available exclusively from dental offices. If you’re focused on gum health and want a model with strong clinical backing, the Aquarius gives you that extra assurance—but you’ll need to get it through a dental office, which might affect availability.
• White Cordless Select 5100 Water Flosser – White (WF-28W010): Perfect for small bathrooms and travel with an ultra-quiet and waterproof design, EasySpin 360-degree tip rotation, high-capacity rechargeable battery and travel mode. This model is built for convenience and flexibility—ideal if you have limited counter space or want a flosser that’s quiet and can handle a wet environment without worry.

Which one fits you?

Best for

• People who prioritize gum health and want clinically proven effectiveness (choose Aquarius).
• Those who have space for a countertop unit and don’t need portability or waterproofing (choose Aquarius).

Not for

• People who want a quiet, waterproof flosser for small bathrooms or travel (choose Select 5100).
• Budget-conscious shoppers who want a reliable flosser without paying extra for clinical claims (choose Select 5100).

Both the Waterpik Aquarius Professional (WP-670) and Select 5100 (WF-28W010) are excellent countertop water flossers, but they cater to different needs. If you want the most advanced clinical performance for gum health and don’t mind the higher price, go with the Aquarius. If you prefer a quiet, waterproof, and more affordable option that still gets the job done, the Select 5100 is your match. Choose based on what matters most to your daily routine.