MSD is another name that is used to describe Marine Sanitation Device and is put to use extensively to treat sewage water that keeps collecting on the water vessels. This is an extremely useful device and hence very popular all over the world. This neat gadget is very helpful for those who work on ships as this device is made to maintain proper sanitation on the ships. The device processes human waste and grey water before being dumped into the ocean, so that way you get to be a responsible citizen who does his or her part for the environment. This sanitation device is not very difficult to use, only a couple of days of training and you can use it without problems.