COSLUS C20 Cordless Water Flosser vs Waterpik Cordless Pulse Water Flosser 3100
What owners say · Updated October 2026
Both devices offer cordless, waterproof flossing that can be used directly in the shower. Owners report that battery performance and long-term hardware failure points differ between the two models.
COSLUS
COSLUS C20 Cordless Water Flosser
“An remarkably effective and budget-friendly alternative to name-brand water flossers, though long-term durability can be hit-or-miss.”
Choose it if you want a cordless flosser with adjustable pressure modes and a battery that lasts up to two weeks per charge.
Waterpik
Waterpik Cordless Pulse Water Flosser 3100
“The Waterpik Cordless Pulse 3100 delivers serious plaque-fighting power and shower-friendly convenience, but long-term durability and frequent water refills frustrate owners.”
Choose it if you want a cordless flosser with an ergonomic non-slip grip, an LED battery indicator, and targeted cleaning around retainers or crowns.
At a glance
| COSLUS C20 Cordless Water Flosser | Waterpik Cordless Pulse Water Flosser 3100 | |
|---|---|---|
| Ease of use and design complaints | 18% of reports | 30% of reports |
Share of each model's owner reports raising ease of use and design; the category average is 16%.
Where owners report a difference
| COSLUS C20 Cordless Water Flosser | Waterpik Cordless Pulse Water Flosser 3100 | |
|---|---|---|
| Battery performance | Owners note that the battery lasts up to two weeks per charge. | Owners note long battery life with an LED indicator, though battery performance can decline after a year. |
| Long-term durability | Owners report occasional motor failures occurring after several months. | Owners report leaking components, declining battery performance after a year, and a fragile water reservoir chamber prone to cracking. |