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Checking the mask under water to ensure the seals are tight is unnecessary for verifying mask functionality. This action is not a standard procedure for routine checks and isn't typically required in most practical situations. Instead, a visual inspection of the mask, ensuring the straps are secure, and verifying that the filters are clean are all critical to making sure the mask provides adequate protection. These steps directly address potential issues that could affect the mask's performance during use.

The visual inspection allows the user to identify any obvious damage or wear, while ensuring the straps are tight helps achieve a proper fit, enhancing the mask's seal against the face. Meanwhile, clean filters are essential for ensuring that the mask can effectively filter out harmful particles. In contrast, checking the seals under water is not a common practice in everyday use and may not effectively assess the mask's integrity in a real-world environment.