| Features | Small | Easy to repair | Energy efficiency | Convenient for the user | Creates enough fresh water | Provides a long enough time period under UV light | Total Score |
Solution I | 4 | 2 | 3 | 3 | 5 | 4 | 21 |
Solution II | 3 | 3 | 2 | 2 | 5 | 5 | 20 |
Solution III | 5 | 1 | 4 | 5 | 5 | 4 | 24 |
| Solution IV  | 4 | 2 | 3 | 4 | 5 | 5 | 23 |
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