Waterpik
Waterpik Aquarius WP-660
$99.99
Released 2013
Best Water Flossers · head-to-head
Waterpik Aquarius WP-660 vs Coslus C20 Water Flosser (F5020E)
A sourced, side-by-side comparison. Coslus C20 Water Flosser (F5020E) is cheaper at $42.99. Every spec and price links to its source.
Coslus
Coslus C20 Water Flosser (F5020E)
$42.99Cheaper
Released 2022
Which is better: the Waterpik Aquarius WP-660 or Coslus C20 Water Flosser (F5020E)?
On the specs we track, they're closely matched. The Coslus C20 Water Flosser (F5020E) is the cheaper at $42.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Waterpik Aquarius WP-660 | Coslus C20 Water Flosser (F5020E) |
|---|---|---|
| US price | $99.99 | $42.99 |
| Brand | Waterpik | Coslus |
| Released | 2013 | 2022 |
| Type | countertop | cordless |
| Tank capacity (ml) | 651 | 300 |
| Pressure settings | 10 | 3 |
| Max pressure (psi) | 100 | 120 |
| Tips included | 7 | 5 |
| Power | corded | rechargeable |
| Runtime min | 1.5 | 1 |
| Release | 2013 | 2022 |
Sources — Waterpik Aquarius WP-660: waterpik.com (verified 2026-06-19). Coslus C20 Water Flosser (F5020E): coslus.com (verified 2026-06-19).
What's the difference between the Waterpik Aquarius WP-660 and Coslus C20 Water Flosser (F5020E)?
Where the two actually differ on the specs we track (7 of 7). Matching specs are omitted.
- Type: Waterpik Aquarius WP-660 countertop vs Coslus C20 Water Flosser (F5020E) cordless
- Tank capacity (ml): Waterpik Aquarius WP-660 651 vs Coslus C20 Water Flosser (F5020E) 300
- Pressure settings: Waterpik Aquarius WP-660 10 vs Coslus C20 Water Flosser (F5020E) 3
- Max pressure (psi): Waterpik Aquarius WP-660 100 vs Coslus C20 Water Flosser (F5020E) 120
- Tips included: Waterpik Aquarius WP-660 7 vs Coslus C20 Water Flosser (F5020E) 5
- Power: Waterpik Aquarius WP-660 corded vs Coslus C20 Water Flosser (F5020E) rechargeable
- Runtime min: Waterpik Aquarius WP-660 1.5 vs Coslus C20 Water Flosser (F5020E) 1