Water Flossers: The Most Common Problems Owners Report
Updated October 2026
We sorted 62 owner reports on 3 water flossers by topic. The problem owners raise most is ease of use and design. See which models they report it on least.
Problems by how often owners raise them
- Ease of use and design10 of 62 reports
- Durability and reliability9 of 62 reports
- Build quality and materials4 of 62 reports
- Cleaning performance3 of 62 reports
Ease of use and design
10 of 62 owner reports raise a problem with ease of use and design, and 9 praise it. By model, fewest problems first:
Fewest complaints: Waterpik Aquarius Countertop Water Flosser WP-660, raised in 0 of its 20 owner reports.
🛒 Buy on Amazon| Model | Raise a problem | |
|---|---|---|
| Waterpik Aquarius Countertop Water Flosser WP-660 | 0 of 20 | On Amazon → |
| COSLUS C20 Cordless Water Flosser | 4 of 22 | On Amazon → |
| Waterpik Cordless Pulse Water Flosser 3100 | 6 of 20 | On Amazon → |
Durability and reliability
9 of 62 owner reports raise a problem with durability and reliability, and 3 praise it. By model, fewest problems first:
Fewest complaints: COSLUS C20 Cordless Water Flosser, raised in 1 of its 22 owner reports.
🛒 Buy on Amazon| Model | Raise a problem | |
|---|---|---|
| COSLUS C20 Cordless Water Flosser | 1 of 22 | On Amazon → |
| Waterpik Cordless Pulse Water Flosser 3100 | 3 of 20 | On Amazon → |
| Waterpik Aquarius Countertop Water Flosser WP-660 | 5 of 20 | On Amazon → |
Build quality and materials
4 of 62 owner reports raise a problem with build quality and materials, and 2 praise it. By model, fewest problems first:
Fewest complaints: COSLUS C20 Cordless Water Flosser, raised in 1 of its 22 owner reports.
🛒 Buy on Amazon| Model | Raise a problem | |
|---|---|---|
| COSLUS C20 Cordless Water Flosser | 1 of 22 | On Amazon → |
| Waterpik Cordless Pulse Water Flosser 3100 | 1 of 20 | On Amazon → |
| Waterpik Aquarius Countertop Water Flosser WP-660 | 2 of 20 | On Amazon → |
Cleaning performance
3 of 62 owner reports raise a problem with cleaning performance, and 17 praise it. By model, fewest problems first:
Fewest complaints: COSLUS C20 Cordless Water Flosser, raised in 0 of its 22 owner reports.
🛒 Buy on Amazon| Model | Raise a problem | |
|---|---|---|
| COSLUS C20 Cordless Water Flosser | 0 of 22 | On Amazon → |
| Waterpik Cordless Pulse Water Flosser 3100 | 1 of 20 | On Amazon → |
| Waterpik Aquarius Countertop Water Flosser WP-660 | 2 of 20 | On Amazon → |
Each owner report is counted once per topic, as a problem when it describes a failure or annoyance. Counts cover the owner reports behind our current verdicts for this category and refresh when those verdicts change.