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| Main criteria | Subcriteria | Description |
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| Cost criterion (CC) | System installation cost (C1) | It is the infrastructure cost required for the installation of the system. It varies according to the complexity of the system and the amount of freshwater to be obtained. |
| System operation cost (C2) | Distillation and filtration costs will be compared mutually. The operating costs of distillation with the heat coming from the chimney and the electricity-consuming filter pump coming from the alternator will be compared. |
| Safety criterion (SC) | Environment pollution risk of the system (C3) | The risks of a possible failure, leakage into the sea, or polluting the sea of the systems will be compared. |
| Risk to human health (C4) | In a possible unusual, emergency and/or a leak into the freshwater tank, the risks of affecting the human health of the systems will be mutually evaluated. |
| Technical criterion (TC) | Easiness of maintenance (C5) | Every freshwater tank needs to be cleaned, and every freshwater treatment system needs to be maintained at regular intervals. The criterion of easiness of maintenance will be compared for each alternative. |
| User-friendliness (C6) | The ease of use of the system is very important and some long-term ballast operations can be tiring. In this criterion, operation time, difficulty, and easiness will be compared. |
| Easiness for ship deployment (C7) | Deployment of the system on the ship plays a very effective role in system selection. In some cases, the system that does not comply with the relevant ship design or does not have enough free space for the installation of the system on the ship prevents the installation of the freshwater treatment system to be selected in the future.
The criteria of easiness for ship deployment, having sufficient space, being suitable for installation in design, and ease of installation are highly important criteria for future system deployment. |
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