What must be done with a Type III MSD?

A Type III Marine Sanitation Device (MSD) is designed to hold sewage onboard a vessel until it can be disposed of properly. The correct answer emphasizes the importance of responsible waste management practices. When using a Type III MSD, the collected waste must be disposed of at a pump-out station, where it can be treated or dealt with in an environmentally safe manner. This ensures that sewage does not contaminate the water, which can have serious consequences for marine life and public health.

Using a pump-out station is a key part of maintaining compliance with environmental regulations and protecting waterways from pollution. This is particularly relevant in areas where boating and recreation activities take place, as improper disposal of waste can lead to pollution and negative impacts on aquatic ecosystems. Proper disposal reinforces environmentally friendly practices among boaters and promotes a healthier environment for all water users.

The other options do not promote responsible waste management. Directly discharging waste into the water can lead to severe environmental damage. Leaving the MSD unattended also neglects proper maintenance and environmental duties, and using it only for holding water is not its intended purpose and does not address waste management needs.